1,322 Developer Tools (2026)

Open-source voice AI platform with visual builder and MCP integration

Dograh is an open-source voice AI platform and visual workflow builder. It enables teams to build self-hosted conversational agents, plug in BYOK models and speech engines, connect telephony providers, and orchestrate tools via Model Context Protocol.

The smallest PaaS implementation

Dokku is a Docker-powered, open-source mini-Heroku that gives you the smallest PaaS implementation for deploying applications on your own server. Push with Git, build via Heroku buildpacks or Dockerfiles, and get automatic subdomains, SSL, zero-downtime deploys, and add-on plugins for databases and services. Ideal for self-hosted developers who want Heroku ergonomics without the cloud vendor bill.

Open-source PaaS alternative to Vercel, Heroku, and Netlify

Dokploy is a free open-source platform-as-a-service for self-hosting applications without cloud vendor lock-in. It provides automated deployments from Git repositories, built-in SSL certificates, database provisioning, Docker and Docker Compose support, and a clean web dashboard for managing multiple applications on your own servers. With 18,000+ GitHub stars, it fills the gap for teams wanting Vercel-like deployment simplicity on their own infrastructure.

ByteDance multimodal document image parser

Dolphin is ByteDance's multimodal document parsing model that handles intertwined text, tables, formulas, and figures in complex documents. Using a two-stage analyze-then-parse approach with a Swin Transformer vision encoder and MBart decoder, it performs layout analysis and parallel element parsing with heterogeneous anchor prompts. Dolphin-v2 adds document-type awareness for invoices, papers, and forms.

Universal secrets management platform

Doppler is a secrets management platform that centralizes environment variables and configuration across applications, CI/CD pipelines, and cloud infrastructure. Features automatic secret syncing to 150+ integrations including AWS, GCP, Azure, Vercel, Netlify, Docker, and Kubernetes. Provides versioned secret history, access controls with audit logs, secret rotation, environment-specific configs, and a CLI for local development. Replaces scattered .env files with a single source of truth.

Visual app builder for CRUD and admin tools

DronaHQ is a visual application builder for CRUD interfaces and admin tools that uses AI to assist in creating complex logic flows and database connections. It provides a low-code platform for building maintainable business applications at scale, targeting internal operations teams who need custom tools with database integrations, form builders, and workflow automation without full custom development.

AI-native SAST with contextual security analysis

DryRun Security is an AI-native SAST platform using Contextual Security Analysis to reason about code behavior, data flow, and exploitability instead of regex pattern matching. It provides PR-native security reviews on GitHub and GitLab, catching logic flaws, broken auth, IDOR, and injection bugs that legacy scanners miss while cutting 90% of noise. Features Natural Language Code Policies, DeepScan for full-repo audits, and a Risk Register for org-wide visibility. Supports 14+ languages.

Open-source control plane for AI workloads across multi-cloud GPU infrastructure

dstack is an open-source platform that orchestrates AI training and inference workloads across heterogeneous GPU infrastructure spanning multiple clouds, Kubernetes clusters, and bare-metal servers. It abstracts away cloud-specific APIs so teams define GPU requirements declaratively and dstack automatically provisions the cheapest available resources from AWS, GCP, Azure, Lambda, or on-premises hardware.

In-process analytical SQL database

DuckDB is a high-performance analytical database that runs as an in-process SQL OLAP engine. Unlike traditional client-server databases, DuckDB embeds directly within your application, similar to SQLite but optimized for analytical queries. It supports complex SQL including window functions, CTEs, and nested types while processing columnar data with vectorized execution. DuckDB reads Parquet, CSV, JSON, and Arrow formats natively and integrates with Python and R data science workflows.

Local open-source AI app builder running entirely on your machine

Dyad is a local-first, open-source AI app builder with 20,000+ GitHub stars that provides a Lovable and Bolt.new alternative running entirely on your machine. It supports React and Next.js frameworks, integrates with Ollama for fully offline AI generation, and works cross-platform on macOS, Windows, and Linux with both cloud and local LLM providers.

Pluggable JavaScript and TypeScript linter

ESLint is the standard open-source linter for JavaScript and TypeScript with 26K+ GitHub stars. Statically analyzes code to find problems, enforce coding conventions, and automatically fix issues. Features a pluggable rule architecture with 300+ built-in rules and thousands of community plugins for React, Vue, Angular, Node.js, and more. Flat config system in ESLint v9 simplifies configuration. Integrates with every major editor, CI/CD pipeline, and build tool in the JavaScript ecosystem.

Your CI/CD scripts as code. Consistent, reproducible builds.

Build automation framework that combines Dockerfile and Makefile syntax for repeatable, containerized builds. Earthly runs every step in a container so builds produce identical results on dev laptops and CI, augmenting Make/Gradle/npm/cargo with cross-language reproducibility. Features parallel target execution, layer caching, multi-platform builds, and references across Earthfiles or repositories.

Open-source IDE for Java and enterprise development

Long-standing open-source IDE primarily for Java development, backed by the Eclipse Foundation. Features powerful Java tooling with refactoring, debugging, JUnit integration, and Maven/Gradle support. Extensible via a massive plugin marketplace covering C/C++, Python, PHP, and web development. Includes built-in Git support, terminal, and XML/JSON editors. Used extensively in enterprise Java, Android (legacy), and embedded systems development. Free and cross-platform.

Postgres sync engine for local-first and real-time applications

ElectricSQL is a sync engine that keeps local application state synchronized with PostgreSQL in real-time. It enables local-first architectures where apps work offline with instant responsiveness, syncing data bidirectionally when connectivity is available. Supports partial replication with shape-based subscriptions to sync only relevant data subsets to each client.

Ultra-fast desktop apps with TypeScript, Bun, and Zig

Electrobun is an open-source cross-platform desktop app framework that combines TypeScript with Bun runtime and Zig for native performance. It produces 12MB base installs versus hundreds of MB for Electron, while maintaining full web technology compatibility. Electrobun uses the system's native webview instead of bundling Chromium, delivers sub-second cold starts, and provides native OS integrations through a Zig bridge layer.

Lifelike AI voice generation, cloning, and voice agents

ElevenLabs is an AI voice platform for text-to-speech, voice cloning, and conversational AI agents, built on models like Multilingual v2 and the low-latency Flash v2.5 and Turbo v2.5. Developers call its API to generate lifelike narration, clone voices from short audio samples, dub content across 30+ languages, add sound effects, and deploy real-time voice agents for customer service, IVR, and interactive apps, with SDKs for Python, JavaScript, and more.

Kernel-space host intrusion detection system

Elkeid is ByteDance's open-source HIDS for hosts, containers, Kubernetes, and serverless workloads. Its kernel-level data collection via Kprobe hooks captures process lineage, privilege escalation attempts, file access patterns, and network connections with minimal overhead. Includes an Agent for telemetry, Detector for rule evaluation, Controller for policy management, and a Dashboard for alerts and investigation.

Prompt engineering framework treating prompts as versioned Python functions

Ell is a prompt engineering library that treats LLM prompts as versioned, testable Python functions rather than opaque strings. Built by ex-OpenAI researcher William Guss, it provides automatic prompt versioning with content-addressable hashing, a local TensorBoard-like studio for visualizing prompt evolution, and structured output support via Pydantic. 5,800+ GitHub stars, MIT licensed. Designed for teams who want to version-control and systematically improve their prompts over time.

Extensible self-documenting editor with Elisp environment

GNU Emacs is the extensible, self-documenting text editor that has served as a complete computing environment for developers since 1985. More than a text editor, Emacs is a Lisp-based platform that can be extended to handle virtually any text-related task — from writing code to managing email, shells, git, and org-mode planning. Highly keyboard-driven, deeply customizable, and completely free/GPL.

AI coding agent for embedded systems and firmware engineering

Embedder is a specialized AI coding agent for firmware and embedded systems development. It supports 400+ MCU variants including STM32 and ESP32, parses hardware datasheets to understand register maps and pin configurations, and verifies generated code by interacting with physical boards via serial console. YC S25 participant currently in beta.

Multimodal data labeling and curation for production AI

Encord is a data labeling and curation platform for teams building production AI systems with complex multimodal data. It supports image, video, audio, DICOM medical imaging, and 3D point cloud annotation with AI-assisted labeling, advanced ontology management, and quality assurance workflows. Features active learning for prioritizing high-value samples and integrates with major ML frameworks.

Dependency lifecycle management and risk reduction

Endor Labs is a dependency management platform that goes beyond vulnerability scanning to assess the overall risk of open-source dependencies. Evaluates maintainer activity, code quality, popularity trends, licensing, and operational risk alongside CVEs. Features reachability analysis to determine if vulnerabilities are actually exploitable in your codebase. Provides dependency selection guidance for choosing safer alternatives. Reduces alert fatigue by prioritizing truly risky dependencies.

Code management platform for AI coding agents

Entire is an AI-native code management platform designed for teams managing fleets of AI coding agents. Founded by former GitHub CEO Thomas Dohmke, it records the reasoning and instructions behind AI-generated code alongside the code itself, making agent-written software easier to review, audit, and maintain. Launches with Checkpoints, an open-source CLI tool that logs prompts and token usage for Claude Code and Google Gemini CLI, with more agent integrations planned.

Console for mobile browsers

Open-source mobile web console that embeds a full developer toolkit into any mobile browser. Provides console, element inspection, network monitor, resource viewer, performance timing, and JavaScript execution on devices that lack native DevTools. The de facto standard for debugging responsive layouts, mobile-specific JavaScript errors, and production issues on phones — loaded with a single script tag or a browser extension.

AI-powered DAST platform specializing in API and GraphQL security

Escape is an AI-powered dynamic application security testing platform focused on API security including REST, GraphQL, and gRPC endpoints. It automatically discovers and tests API endpoints for vulnerabilities without requiring source code access. Features business logic testing that goes beyond OWASP patterns, CI/CD integration for shift-left security, and detailed remediation guidance for developers.

Community fork of Codex CLI with Auto Drive, browser integration, and multi-agents

Open-source terminal coding agent (npm `@just-every/code`) — a substantive community fork of OpenAI's Codex CLI adding Auto Drive orchestration, browser/CDP integration, multi-agent commands, theming, and Auto Review, while staying upstream-compatible.

Agent harness performance system with 30+ agents and 136 skills

Everything Claude Code is a comprehensive agent harness performance optimization system providing 30 specialized agents, 136 skills, 60 commands, and automated hook workflows for AI-assisted development. Born from an Anthropic hackathon winner and evolved over 10+ months of intensive daily use, it works across Claude Code, Codex, Cursor, and OpenCode with built-in security scanning via AgentShield, continuous learning, and research-first development patterns.

Virtual whiteboard for sketching

Open-source virtual whiteboard for creating hand-drawn style diagrams, wireframes, and sketches in the browser. Features real-time collaboration, shape libraries, infinite canvas, text support, arrow connectors, and export to PNG/SVG. The hand-drawn aesthetic makes diagrams feel informal and approachable. Works offline as a PWA. Embeddable in Notion, Obsidian, and other tools. Used extensively for architecture diagrams, brainstorming, and technical communication. 95K+ GitHub stars.

PyTorch on-device AI for mobile and edge devices

ExecuTorch is PyTorch's official solution for deploying AI models on mobile, embedded, and edge devices. It features a 50KB base runtime, 12+ hardware backends including Apple CoreML, Qualcomm QNN, ARM, and Vulkan, and native PyTorch export without format conversions. Powers Meta's on-device AI across Instagram, WhatsApp, Quest 3, and Ray-Ban Smart Glasses, supporting LLMs, vision, speech, and multimodal models.

MCP gateway and integration catalog for AI agents

Executor is an MIT-licensed integration layer and MCP gateway for AI agents. It gives Claude Code, Cursor, Codex, and other MCP-speaking clients one endpoint for connected OpenAPI specs, GraphQL APIs, MCP servers, Google Discovery sources, and custom JavaScript tools, with local, cloud, and self-hosted deployment options for teams centralizing tool access.

Modular AI prompt framework for everyday tasks

Fabric is an open-source framework that organizes AI prompts into reusable patterns for solving everyday tasks like summarizing content, explaining code, extracting insights from videos, and generating social media posts. Written in Go with support for 20+ AI providers including OpenAI, Claude, Gemini, and Ollama, it runs from the command line and can serve as a REST API. With 40,000+ GitHub stars, Fabric bridges the gap between AI capabilities and practical workflow automation.

Python toolkit for assessing and mitigating ML model fairness issues

Fairlearn is a Microsoft-backed open-source Python toolkit that helps developers assess and improve the fairness of machine learning models. It provides metrics for measuring disparity across groups defined by sensitive features, mitigation algorithms that reduce unfairness while maintaining model performance, and an interactive visualization dashboard for exploring fairness-accuracy trade-offs. Integrated with scikit-learn and Azure ML's Responsible AI dashboard.

Cloud native runtime security for Kubernetes

Falco is a CNCF graduated open-source runtime security tool that detects unexpected behavior and threats across containers, Kubernetes, and cloud workloads in real time. Originally created by Sysdig, Falco monitors Linux kernel syscalls using eBPF and applies customizable detection rules to alert on malicious activity like container escapes, cryptojacking, unauthorized file access, and anomalous network connections. It supports 50+ alert output channels including SIEM integration.

Zero-config conversion of FastAPI endpoints into MCP tools

FastAPI-MCP automatically converts existing FastAPI endpoints into Model Context Protocol tools with zero configuration. With 11,700+ GitHub stars, it is the most popular MCP integration layer, enabling thousands of FastAPI developers to make their APIs accessible to AI agents like Cursor and Claude through the MCP standard.

Python web framework with HTMX, no JavaScript needed

FastHTML is an open-source Python web framework by Answer.AI that renders HTML directly from Python functions using HTMX. It eliminates the JavaScript build step entirely, letting developers create interactive web apps with pure Python. FastHTML is designed for AI demo apps, admin tools, and internal tooling where full-stack simplicity matters more than SPA complexity. Built by Jeremy Howard's team.

Open-source feature store for machine learning

Feast is an open-source feature store that manages and serves ML features for both training and online inference. It prevents training-serving skew by providing consistent feature access across offline and real-time environments. Feast supports batch materialization from data warehouses, real-time feature retrieval, on-demand transformations, and integrates with major data platforms including BigQuery, Snowflake, Redshift, and DynamoDB.

Generate SDKs and API documentation from OpenAPI specs

Fern is a platform that generates idiomatic client SDKs and beautiful API documentation from OpenAPI specifications. It produces type-safe SDKs for TypeScript, Python, Java, Go, Ruby, and C# with features like pagination, retries, and streaming built in. The documentation includes API reference, guides, and an AI-powered search assistant. Used by companies like Cohere, ElevenLabs, and Merge.

Open-source toolkit for curating datasets and evaluating visual AI models

FiftyOne is an open-source Python toolkit from Voxel51 for building high-quality datasets and better computer-vision and multimodal AI models. It pairs a browser-based visualization App with programmatic dataset curation, embeddings, similarity search, and model-evaluation workflows.

Security operations resilience for SOC teams

Fig provides a Security Operations Resilience platform designed for modern SOC teams facing both unplanned and planned changes. Features drift detection to catch unplanned infrastructure changes, automated drift repair with testing, planned change modeling to simulate initiatives before deployment, version control, and automatic deployment with rollbacks. Helps teams maintain security coverage while shipping risk-free at 10x speed and focusing on strategic cyber work.

Turn a Figma design system into a programmable API for AI assistants

Figma Console MCP is open-source design-system infrastructure that exposes Figma to AI assistants through MCP. It supports structured extraction, design creation and editing, debugging, accessibility audits, and bidirectional design-token workflows across local, remote read-only, and paired cloud modes; it is not a generic one-click Figma-to-code exporter.

Design-to-code handoff and CSS generation

Figma Dev Mode is a dedicated workspace within Figma designed specifically for developers to inspect designs, extract code snippets, and access implementation details without navigating the full design environment. It solves the design-to-development handoff problem by providing a focused, code-oriented view with measurements, component properties, design tokens, and ready-to-use code in CSS, iOS, and Android formats.

AI QA agent specialized for mobile apps

FinalRun is a specialized AI QA agent for mobile applications that automates testing of complex mobile gestures and flows on both iOS and Android platforms. It addresses the specific mobile QA gap that generic web-testing tools miss, handling touch interactions, swipe gestures, device rotation, and platform-specific behavior that require mobile-native understanding.

Unified multi-cloud cost management with MegaBill

Finout unifies cloud costs from AWS, Azure, GCP, Snowflake, and other providers into a single MegaBill dashboard with AI-based anomaly detection for flagging unusual spend patterns. Priced at approximately 1% of cloud spend, it solves the multi-tool cost fragmentation problem for organizations managing complex infrastructure budgets across multiple cloud and SaaS providers.

Google's AI-powered cloud IDE for full-stack app development

Firebase Studio is Google's cloud-based development environment that integrates Gemini AI for building, testing, and deploying full-stack applications. It provides browser-based coding with AI assistance for code generation, debugging, and database design. Connects natively with Firebase services including Firestore, Authentication, Cloud Functions, and Hosting for seamless deployment.

Open-source multi-protocol API client

Firecamp is an open-source API DevTool supporting REST, GraphQL, WebSocket, and Socket.IO protocols as a lightweight alternative to Postman. It provides IntelliSense, team collaboration with shared workspaces, and seamless import from OpenAPI, Insomnia, AsyncAPI, and HAR formats. Each protocol gets a dedicated testing playground with response metrics including time, size, and status codes.

Open-source microVMs for secure serverless and AI agent sandboxing

Firecracker is an open-source virtual machine monitor that creates lightweight microVMs with sub-150ms cold starts, originally built by AWS for Lambda and Fargate. With 28,000+ GitHub stars, it provides kernel-level isolation for running untrusted code safely and powers the sandboxing infrastructure behind AI coding agents like Devin and E2B.

Production-grade inference with serverless and on-demand GPUs

High-performance inference platform serving open-source and custom AI models at global scale, processing 13+ trillion tokens daily at ~180K requests per second. Fireworks AI delivers 1,000+ tokens per second on large models through quantization-aware tuning and adaptive speculation, with serverless, fine-tuning, and dedicated GPU options across text, image, and audio modalities.

The friendly interactive shell

User-friendly interactive shell for Linux and macOS that works great out of the box with zero configuration needed. Features autosuggestions based on command history (accept with right arrow), syntax highlighting as you type, tab completions with inline descriptions, web-based configuration UI for themes and settings, and a scripting syntax that is simpler than bash/zsh. Not POSIX-compatible by design. Popular among developers who want a productive shell without customization effort.