Directus

Open-source backend-as-a-service platform

Appwrite is an open-source BaaS platform with 56K+ GitHub stars providing authentication, databases, storage, functions, messaging, and real-time APIs out of the box. Self-hostable alternative to Firebase with 15+ client and server SDKs. Features OAuth login with 30+ providers, document-based database with queries, file storage with image transforms, serverless functions, and push notifications. Docker-based deployment with a web console for management.

Open-source headless CMS for developers

Strapi is the leading open-source headless CMS with 65K+ GitHub stars providing a customizable API-first content management system. Auto-generates REST and GraphQL APIs from content types defined through a visual builder. Features role-based access control, media library, internationalization, draft/publish workflow, and a plugin marketplace. Built with Node.js and supports PostgreSQL, MySQL, SQLite, and MariaDB. Self-hostable with Strapi Cloud also available.

Open-source TypeScript headless CMS and app framework

Payload is an open-source TypeScript-first headless CMS and app framework with 32K+ GitHub stars. Built on Next.js with PostgreSQL or MongoDB, it provides auto-generated REST and GraphQL APIs, a customizable admin panel, access control, localization, versioning, and file uploads. Config-as-code defines collections in TypeScript for full type safety. Features live preview, draft system, block-based editor, and extensible plugins. Self-hostable with no vendor lock-in.

Single-binary open-source backend

PocketBase is an open-source backend in a single Go binary with 44K+ GitHub stars providing a real-time database, authentication, file storage, and admin dashboard. No dependencies, no Docker required — just download and run. Features collection-based data modeling, REST API, real-time subscriptions, OAuth2 authentication, file uploads with thumbnails, and a built-in admin UI. Extends with custom Go code or JavaScript hooks. Ideal for prototyping, MVPs, and small-to-medium applications.

Open standard for portable skills across AI agents

Agent Skills is the open SKILL.md folder specification for packaging reusable instructions, scripts, references, and assets that compatible AI agents load through progressive disclosure. Originally developed by Anthropic and released as an open standard, it defines the portable format itself—not an example library, marketplace, or hosted agent product.

Heterogeneous CPU-GPU inference and SFT for large MoE models

Open-source framework for running and fine-tuning large Mixture-of-Experts models with heterogeneous CPU-GPU execution, optimized kernels, limited VRAM and SGLang or LLaMA-Factory integrations.

Official Kubernetes and Helm reference stack built on the vLLM inference engine

Official vLLM reference implementation for scaling the existing inference engine on Kubernetes with Helm, request routing, KV-cache offload, autoscaling and Prometheus/Grafana observability.

Distributed inference orchestration above vLLM, SGLang and TensorRT-LLM

Open-source, datacenter-scale orchestration layer that coordinates vLLM, SGLang and TensorRT-LLM across nodes with disaggregated serving, KV-aware routing, multi-tier cache management and automatic scaling.

Open-source GPU control plane for scalable AI model serving

Open-source GPU cluster manager that configures vLLM, SGLang, TensorRT-LLM or custom engines, serves models through compatible APIs, and provisions SSH-accessible GPU instances across on-premises, Kubernetes and cloud environments.

Test and debug MCP servers before they ship

Open-source platform for inspecting, debugging and regression-testing MCP servers, MCP Apps and ChatGPT apps, with OAuth and protocol conformance for local and CI workflows.