Open source codegen projects
Every project in the registry tagged codegen, ranked by real GitHub adoption.
AI-powered code completion for seamless development
The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.
👨🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode,
NodeJS library that generates Typescript or Javascript clients based on the OpenAPI specification
OpenAPI v3 code generator for go
🧡 The meta framework for code generation. Automate OpenAPI to type-safe TypeScript, Zod, and TanStack Query with a modular, plugin-based engine.
Related tags
Frequently asked questions
How many open source codegen projects are there?
This registry tracks 6 projects tagged codegen, with 54,201 GitHub stars between them. The most-adopted is Tabby at 33,921 stars.
Are these codegen projects free to use?
Yes — 5 of the 6 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which codegen project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these codegen projects still maintained?
5 of the 6 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.