Top Open Source Projects Built With OpenAI in 2026
A curated collection of the 72 best free and open-source projects built using OpenAI. Discover popular repositories, architecture patterns, and trending software in 2026.
Zenblog
Headless blogging CMS with Notion-style editor
Stars253Last commit5mo agoLicenseAGPL-3.0Chroma
Open-source search infrastructure for AI
Stars29,157Last commit11d agoLicenseApache-2.0UnKey
Unified API platform for deployment and observability
Stars5,423Last commit11d agoLicenseOpen SourceSpanlens
Open source LLM observability & monitoring
Stars12Last commit16d agoLicenseMIT
Papermark
Open-source DocSend alternative with analytics
Stars8,977Last commit11d agoLicenseOpen SourceLiteLLM
Acts as a unified proxy across 100+ LLMs, normalizing them to the OpenAI format while handling virtual keys, budgets, rate limits, fallbacks, and cost tracking.
Stars57,381Last commit10d agoLicenseOpen Source
Inbox Zero
AI email assistant to reach inbox zero fast
Stars12,094Last commit11d agoLicenseOpen Source
Flowglad
Unified workspace for cross-system automations
Stars1,718Last commit3mo agoLicenseOpen SourceContentport
AI-powered Twitter content engine for growing accounts
Stars764Last commit8mo agoLicenseAGPL-3.0WunderGraph
Open-source GraphQL Federation platform with governance
Stars1,256Last commit11d agoLicenseApache-2.0Windmill
Code-first platform for internal software
Stars17,693Last commit10d agoLicenseOpen Source
Typebot
No-code chatbot builder for websites & WhatsApp
Stars10,291Last commit13d agoLicenseOpen Source
Typesense
Open-source search engine for fast, typo-tolerant results
Stars26,481Last commit19d agoLicenseGPL-3.0
Abby
Open-source feature flags, remote config, and A/B testing for developers
Stars167Last commit18mo agoLicenseAGPL-3.0
Trigger
Open source platform for AI workflows in TypeScript
Stars16,137Last commit10d agoLicenseApache-2.0
