# Free Tier

Reactive Python notebooks that version with git and deploy as apps

Marimo is a reactive Python notebook environment with 20,000+ GitHub stars and $4M seed funding. Unlike Jupyter, marimo notebooks automatically update dependent cells when values change, version cleanly with git as pure Python files, and deploy directly as interactive web applications without conversion steps.

Enterprise-grade RAG and MCP knowledge base with one-click deployment

MaxKB is an enterprise-grade RAG platform with 21,000+ GitHub stars from the 1Panel team. It provides one-click deployment of knowledge bases with built-in LLM integration, MCP support, and a streamlined approach to document ingestion and retrieval that prioritizes operational simplicity over configuration complexity.

Lightning-fast, open-source search engine — a developer-friendly Algolia alternative.

Meilisearch is an open-source, lightning-fast search engine written in Rust. Designed as a developer-friendly alternative to Algolia with typo tolerance, faceted search, filtering, and sorting out of the box. Sub-50ms response times. Easy to deploy and configure with a RESTful API.

Single-file memory layer replacing complex RAG for AI agents

Memvid is an open-source single-file memory system for AI agents with 13,700+ GitHub stars. It replaces complex RAG infrastructure with instant retrieval from portable .mv2 files, claiming 35% accuracy improvement over state-of-the-art on LoCoMo benchmarks with 0.025ms P50 latency. Available for Python, Node.js, Rust, and CLI.

Connect AI agents to hundreds of integrations via one interface

Metorial is an open-source integration hub that connects AI agents to hundreds of third-party services through a single interface with built-in OAuth handling, scaling, and monitoring. It simplifies the complexity of managing multiple MCP connections by providing a unified connector layer for agentic workflows.

Free MIT-licensed drop-in replacement for LocalStack

MiniStack is a free, MIT-licensed drop-in replacement for LocalStack that emulates 33 AWS services using real infrastructure — actual Postgres for RDS, real Redis for ElastiCache, real Docker for ECS — rather than faking API responses. Born from LocalStack's surprise paywall in March 2026, it starts in 2 seconds, idles at 30MB RAM versus LocalStack's ~500MB, and runs real services for accurate local AWS development.

MCP server for mobile device automation and testing

Mobile MCP is an open-source MCP server that enables AI agents to automate Android and iOS devices — navigating apps, tapping elements, extracting screen content, and running tests on simulators, emulators, and physical devices. It brings agentic mobile engineering to any MCP-compatible AI assistant.

Hyperextensible Vim-based text editor

Modern fork of Vim with Lua-based plugin architecture and built-in LSP support. Lightweight yet endlessly extensible, it serves as the foundation for AI-enhanced development workflows through plugins like Avante, Codecompanion, and Copilot.lua. With 85k+ GitHub stars, it's the terminal editor of choice for developers who value speed, customization, and keyboard-driven efficiency.

Observability data accessible to AI agents via MCP

Netdata's MCP integration exposes infrastructure monitoring, discovery, and root-cause analysis capabilities to AI agents. Built into the 78K+ star Netdata monitoring platform, it lets agents query real-time metrics, explore system health, investigate incidents, and generate observability reports through the Model Context Protocol.

GitHub code navigation sidebar

Browser extension that adds a file tree sidebar to GitHub repositories for easy code navigation. Browse files and folders without leaving the current page, with support for private repos, pull request code review navigation, file search, bookmarks, and theming. Works with GitHub Enterprise. Available for Chrome, Firefox, Safari, and Edge. Essential for navigating large GitHub repos without cloning. Freemium with Pro features for advanced code review and multiple GitHub accounts.

Spec-driven development for AI coding assistants

OpenSpec is an open-source spec-driven development framework by Fission-AI for AI coding assistants. It adds a lightweight spec layer so developers and AI agents agree on what to build before any code is written. OpenSpec organizes changes in dedicated folders for proposals, specs, design docs, and tasks, and works across 21+ AI coding tools including Claude Code, Cursor, Windsurf, Continue, Gemini CLI, GitHub Copilot, and Amazon Q — bringing structured planning to agentic development.

Free open-source screen recording for developer demos

Openscreen is a free, open-source alternative to Screen Studio for creating polished product demos and tutorials. With no subscriptions, no watermarks, and a commercial-use-friendly license, it provides professional screen recording with zoom effects, cursor highlighting, and export options — purpose-built for developers who create documentation and demo content.

Rust-powered JavaScript linter that is 50-100x faster than ESLint

Oxlint is an extremely fast JavaScript and TypeScript linter built as part of the OXC (Oxidation Compiler) toolchain written in Rust. It runs 50-100x faster than ESLint by parsing and analyzing code in a single optimized pass without requiring any plugins or configurations. Oxlint ships with 520+ built-in rules covering correctness, performance, and style checks, and is designed to run alongside ESLint during migration. Part of Evan You's VoidZero initiative, OXC has over 20,000 GitHub stars.

Consumer-driven contract testing for APIs and microservices

Pact is the de-facto contract testing framework for HTTP APIs and event-driven systems across 12+ languages. It verifies that services can communicate correctly by testing API contracts from the consumer's perspective before deployment, catching breaking changes in microservice architectures. Maintained by Pact Foundation with 7,000+ combined GitHub stars across implementations. PactFlow offers a managed SaaS broker. Used widely in enterprise microservice teams to prevent integration failures.

State-of-the-art OCR toolkit supporting 100+ languages from Baidu

PaddleOCR is an open-source OCR toolkit from Baidu's PaddlePaddle ecosystem with over 73,000 GitHub stars. It provides ultra-lightweight and high-accuracy text detection and recognition for 100+ languages including CJK, Arabic, and Indic scripts. The toolkit offers pre-trained models, easy deployment via pip, and server/edge inference options for document digitization workflows.

Conversational data analysis with natural language queries over databases

PandasAI enables natural-language queries against databases, data lakes, CSVs, and parquet files using LLMs and RAG pipelines. With 23,400+ GitHub stars, it bridges the gap between database tools and AI by letting developers and analysts interact with data conversationally, supporting SQL, PostgreSQL, and various file formats.

Real-time ETL and RAG engine with Python API and Rust core

Pathway is an open-source Python ETL framework with a high-performance Rust engine for stream processing, real-time analytics, and RAG pipelines. It handles both batch and streaming data in a unified API, enabling live-updating vector indexes, real-time document processing, and AI agent memory that refreshes as new data arrives. 63,000+ GitHub stars, used for production RAG systems where static vector databases create stale context. Apache 2.0 licensed with enterprise cloud options.

Open-source design and prototyping

Open-source design and prototyping platform offering a free, web-based alternative to Figma and Sketch with self-hosting and no team-size limits. Penpot uses SVG and CSS as native formats for inherent web compatibility, with real-time multiplayer collaboration, vector editing, interactive prototyping, components with variants, design tokens, flex layouts, and Figma file import.

Visual testing and review platform

BrowserStack-owned visual testing platform for automated screenshot comparison across browsers and screen sizes. Integrates with CI pipelines to catch visual regressions before they reach production. Renders pages in real browsers and highlights pixel-level differences, helping frontend teams maintain visual consistency across every supported browser and viewport combination.

Open-source framework for real-time voice and multimodal AI agents

Pipecat is an open-source framework with 11,000+ GitHub stars for building real-time voice and multimodal AI agents. Developed by Daily.co, it manages the STT to LLM to TTS pipeline with sub-second latency, integrating with AWS Bedrock, NVIDIA NIM, and AssemblyAI for production-grade voice agent deployment.

Open-source Jira alternative

Plane is an open-source project management and issue tracking tool designed as a modern, self-hostable alternative to Jira, Linear, and Asana. Gives teams full control over their data and infrastructure while delivering a polished, feature-rich interface. Combines issue tracking, sprint management, documentation (Plane Pages), and modules into a single workspace with cycles, views, and kanban boards.

Visual builder for React with headless CMS

Plasmic is a visual page builder and design tool that integrates directly into existing codebases, letting teams create and manage web pages with a Figma-like canvas while keeping production code under version control. Non-developers can ship marketing pages and CMS content, while engineers expose React components for visual editing. Supports Next.js, Gatsby, Remix, and any React framework.

Browser-based AI IDE for instant web development

Online code playground and IDE for JavaScript, TypeScript, React, Vue, and Angular — write, run, and share code instantly in the browser with zero setup. Full editor with syntax highlighting, IntelliSense, error detection, and direct npm package imports. Supports JSX/TSX, Vue single-file components, HTML/CSS/SCSS with built-in transpilation and bundling. Real-time preview, console output, multi-file projects, code formatting, and share-by-URL or embed in docs.

Autonomous cloud discount management with ML

ProsperOps uses machine learning to continuously optimize cloud commitment coverage including Savings Plans and Reserved Instances, achieving Effective Savings Rates of 40% or more on AWS, GCP, and Azure. It provides autonomous discount management with a performance-based pricing model where ProsperOps shares a percentage of the savings generated, aligning costs with actual value delivered.

Modern test management with AI organization

QA Sphere is a modern, clutter-free test management system that uses AI to organize test cases and track coverage across complex projects. It streamlines the management side of QA that is often handled through messy spreadsheets, providing structured test case repositories, execution tracking, and coverage analytics for technical project managers and QA leads.

World's largest API hub and marketplace

RapidAPI is the world's largest API hub and marketplace connecting developers to thousands of public and private APIs through a single platform. Provides a unified interface for discovering, testing, and managing API connections with standardized authentication, billing, and monitoring. Features an API testing playground, code snippets in multiple languages, team workspaces, and analytics dashboards. Used by millions of developers to integrate third-party services with a single API key.

Beautiful, personalized API docs

Developer hub platform for creating interactive API documentation with try-it-now API explorer, auto-generated references from OpenAPI specs, custom landing pages, changelog, guides, and usage analytics. Features personalized docs that show API keys and example responses based on the logged-in user. Tracks which endpoints developers actually use. Integrates with GitHub for syncing docs from repos. Used by companies like Twilio and Shopify for their developer portals.

Hundreds of GitHub UI enhancements

Open-source browser extension with hundreds of small UX improvements to GitHub: cleaner diffs, one-click PR merging, reaction avatars, linkified commit SHAs, and much more. Fixes dozens of long-standing GitHub UI annoyances that power users encounter daily, making the GitHub web experience feel polished and efficient without waiting for official feature updates.

AI website wireframe and design generator

Generate complete website sitemaps and wireframes with AI in minutes. Relume outputs Figma and Webflow-ready component libraries, with a built-in library of 1000+ components and style guides. Ideal for designers and agencies who need to rapidly prototype client projects without starting from scratch every time.

Cloud for the new default

Unified cloud platform for deploying web services, static sites, background workers, cron jobs, and managed databases with automatic scaling and zero DevOps. Auto-deploy from Git with preview environments, built-in DDoS protection, free TLS, and global CDN. Native runtimes for Node.js, Python, Go, Rust, Ruby, Elixir plus Docker. Managed PostgreSQL and Redis with daily backups, private networking, and infrastructure-as-code via Blueprints. Modern Heroku alternative with a free tier.

Durable execution engine for workflows and AI agents

Restate is a durable execution engine that provides reliable workflow orchestration for AI agents and backend services. It runs as a single binary with no external dependencies, delivering sub-50ms latency and 94K+ actions per second. Supports TypeScript, Python, Go, Java, and Kotlin SDKs with built-in retries, sagas, and virtual object state. MIT licensed with 3,700+ GitHub stars.

Open-source AI coworker with persistent memory and tool use

Rowboat is an open-source AI coworker platform that provides persistent memory, tool use, and multi-agent orchestration in a chat-based interface. It enables teams to build AI assistants that remember context across sessions, access internal tools and databases, and coordinate specialized sub-agents for complex workflows. Over 9,300 GitHub stars.

Extremely fast Python linter and formatter written in Rust

Ruff is a Python linter and code formatter written in Rust by Astral that runs 10-100x faster than existing tools like flake8, isort, and Black. It implements over 800 lint rules from dozens of popular plugins in a single binary, handles auto-fixing for most violations, and includes a built-in formatter compatible with Black. Adopted by FastAPI, Hugging Face, Pandas, and Apache Airflow, Ruff has over 38,000 GitHub stars and processes entire codebases in milliseconds.

Multi-database AI query generator and optimizer

SQLAI.ai is a comprehensive AI toolkit for generating, optimizing, and explaining SQL queries across any database engine including both SQL and NoSQL systems. Supporting schemas with 600+ tables, it handles the full query lifecycle from natural language generation to performance optimization and cross-database migration, starting at $5/month as one of the most affordable AI SQL tools available.

Composable content platform for structured data

Sanity is a composable content platform providing a real-time, API-first content backend with a customizable editing studio. Content is stored as structured data accessible via GROQ query language or GraphQL. Features real-time collaboration, portable text for rich content modeling, image pipeline with on-the-fly transformations, and webhooks for content-driven workflows. The open-source Sanity Studio provides a fully customizable React-based editing interface deployable anywhere.

LLM-powered web scraping with graph-based extraction pipelines

ScrapeGraphAI is a Python library that uses LLMs and graph-based logic to build automated, self-healing web scraping pipelines. Developers describe desired data in natural language and ScrapeGraphAI constructs a processing graph that extracts structured information from any website. It supports multiple LLM providers, achieves 96%+ accuracy on semantic extraction benchmarks, and adapts to layout changes automatically. Over 20,000 GitHub stars.

Auto-capture workflows into step-by-step documentation

Scribe automatically captures your on-screen workflows and converts them into step-by-step documentation with annotated screenshots. Simply perform a process with the browser extension or desktop app active, and Scribe generates a shareable guide with numbered steps, highlighted click targets, and descriptive text. Used for creating SOPs, training materials, and onboarding docs without manual documentation effort.

Browser-based AI SQL editor with modern UX

Sheeta.ai is a browser-based AI SQL editor designed to modernize the data workflow with a simple, intuitive interface and high-accuracy query generation. It addresses the UX gaps of traditional database tools like DBeaver by providing a clean, modern interface with AI-powered query suggestions, schema visualization, and result exploration built for the contemporary data stack.

Where work happens

Enterprise messaging platform for team communication with channels, direct messages, threads, and huddles (audio/video calls). Features rich app integrations via Slack API and Bolt framework, Workflow Builder for no-code automations, Canvas for collaborative docs, Slack Connect for cross-company channels, and file sharing. AI features summarize threads and channels. Integrates with 2,600+ apps. Owned by Salesforce. The de facto real-time communication tool for tech companies and developer teams.

Package manager for MCP servers and agent skills

Smithery is a CLI tool and registry for discovering, installing, and managing MCP servers and agent skills. It lets developers search thousands of available servers, install them with one command, inspect available tools, and connect their AI coding agents to external capabilities through the Model Context Protocol standard.

Self-hosted code understanding for humans and agents

Sourcebot is a self-hosted code intelligence platform that helps developers and AI agents understand large codebases through intelligent search, navigation, and inline-cited answers. Deployed as a Docker container with MCP server support, it indexes thousands of repositories without source code leaving your infrastructure.

Browser-native frontend coding agent for production codebases

Stagewise is an open-source frontend coding agent with 6,500+ GitHub stars that runs directly in the browser on localhost. YC S25 backed, it lets developers and designers point-and-prompt on live web applications with full devtools and console access, bridging the gap between visual editing and production codebase modification.

The minimal, blazing-fast shell prompt

Minimal, blazing-fast, cross-shell prompt written in Rust that works with Bash, Fish, Zsh, PowerShell, Ion, Elvish, and Nushell. Provides a single consistent prompt configuration across every shell, showing Git branch, language versions, and cloud context at a glance. Context-aware modules activate only when relevant, keeping startup fast. Configured through a simple TOML file, adding negligible latency. One of the most popular shell prompt tools in the developer community.

Open-source browser infrastructure for AI agents at scale

Steel is an open-source browser API purpose-built for AI agents, providing managed headless browser sessions with anti-bot bypass, proxy rotation, CAPTCHA solving, and session persistence. It handles the infrastructure layer that browser automation agents like Browser Use and Stagehand run on top of. Self-hostable or available as a cloud service. Over 6,000 GitHub stars.

AI schema generator from natural language

Structa is an AI tool that turns natural language descriptions into production-ready database schemas and SQL in under 45 seconds, focused on PostgreSQL and Supabase. Recognized as an editor's choice for AI schema generation, it is the fastest idea-to-schema tool available, generating optimized table structures, relationships, indexes, and constraints from plain English project requirements.

Mutation testing framework to validate test quality

Stryker Mutator is an open-source mutation testing framework for JavaScript, TypeScript, C#, and Scala that measures the real effectiveness of your test suite. It introduces small code mutations and checks whether tests catch them, revealing gaps that line coverage metrics miss. Supports incremental mode for CI/CD integration.

Open-source generalist AI agent for browser and code tasks

Suna is an open-source generalist AI agent that can autonomously browse the web, write and execute code, manage files, and interact with external services. It features a real-time browser automation engine, an isolated code execution sandbox, and integrations with popular APIs. Designed as an open-source alternative to commercial AI agent platforms. Over 9,000 GitHub stars with rapid community growth.

Open-source library for generating synthetic tabular data

Synthetic Data Vault (SDV) is an MIT-backed open-source Python library for generating synthetic tabular, relational, and time-series data. It learns statistical patterns from real datasets and produces synthetic versions that preserve distributions, correlations, and referential integrity. Supports single-table, multi-table, and sequential data with built-in privacy and quality metrics.