Open source middleware projects
Every project in the registry tagged middleware, ranked by real GitHub adoption.
The tiniest OpenID Certified™ authorization and authentication server you have ever seen.
Distributed scheduled job
Golang gRPC Middlewares: interceptor chaining, auth, logging, retries and more.
Silky smooth profiling for Django
🛵 The stylish Node.js middleware engine for AWS Lambda 🛵
🚀 Realtime Monitoring solution for Node.js/Express.js apps, inspired by status.github.com, sponsored by https://dynobase.dev
FastAPI + Playwright + Camoufox 中间层代理服务器，兼容OpenAI API且支持参数转发。项目通过浏览器自动化将API请求转发到 Google AI Studio Chat，并同样按照OpenAI标准格式返回的工具。内置调试WebUI面板。
Portable project memory across Claude Code, Codex and OpenCode, plus token accounting measured from harness transcripts. Local file I/O, no API calls, no teleme
Frequently asked questions
How many open source middleware projects are there?
This registry tracks 8 projects tagged middleware, with 40,860 GitHub stars between them. The most-adopted is tinyauth at 8,459 stars.
Are these middleware projects free to use?
Yes — 8 of the 8 carry an explicit open-source licence across 3 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 middleware 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 middleware projects still maintained?
6 of the 8 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.