The 15 best open-source LLMs & SDKs libraries in 2026, ranked by our maintenance-health metric plus real adoption (stars and weekly downloads) and security signals. Right now pocketbase leads the field with a 100/100 health score. Each links to a full analysis with install commands, license, and alternatives.
pocketbase is an open-source Go project with 59k GitHub stars. It is associated with authentication, backend, golang, realtime. The repository is actively maintained, with recent commits.
dbeaver is an open-source Java project with 50.5k GitHub stars. It is associated with ai, database, databricks, db2. The repository is actively maintained, with recent commits.
Vercel's AI SDK is a TypeScript toolkit that provides a unified API for calling many LLM providers (OpenAI, Anthropic, Google, etc.), with first-class support for streaming, structured output, tool calling, and agents, plus React/Svelte/Vue hooks for building chat and generative UIs.
ZLMediaKit is an open-source C++ project with 17.1k GitHub stars. It is associated with flv, gb28181, hls, http. The repository is actively maintained, with recent commits.
vitest is an open-source TypeScript project with 16.7k GitHub stars. It is associated with test, testing-tools, vite. The repository is actively maintained, with recent commits.
supertokens-core is an open-source Java project with 15.1k GitHub stars. It is associated with auth0, authentication, aws-cognito, email-password. The repository is actively maintained, with recent commits.
plasmo is an open-source TypeScript project in the llms & sdks space with 13.1k GitHub stars. The repository is actively maintained, with recent commits.
illa-builder is an open-source TypeScript project in the llms & sdks space with 12.3k GitHub stars. The repository is actively maintained, with recent commits.
cosmos is an open-source Jupyter Notebook project in the llms & sdks space with 9.9k GitHub stars. The repository is actively maintained, with recent commits.
node-rate-limiter-flexible is an open-source JavaScript project with 3.6k GitHub stars. It is associated with bruteforce, drizzle, dynamodb, express. The repository is actively maintained, with recent commits.
Self-Hosting-Guide is an open-source Dockerfile project with 20.2k GitHub stars. It is associated with authentication, awesome, awesome-list, decentralized. The repository has seen commits within the last year.
realm-java is an open-source Java project with 11.5k GitHub stars. It is associated with android, database, java, mobile. The repository has seen commits within the last year.
e2e is an open-source Python project with 620 GitHub stars. The repository has seen commits within the last year.
httpexpect is an open-source Go project with 2.7k GitHub stars. It is associated with assertions, http, json, rest. The repository has seen commits within the last year.
api is an open-source PHP project with 9.4k GitHub stars.