Open source rate-limiter projects
Every project in the registry tagged rate-limiter, ranked by real GitHub adoption.
Resilience4j is a fault tolerance library designed for Java8 and functional programming
Secure, scalable API key management for developers
Runtime security for AI apps and agents: prompt injection detection, tool-call authorization, sensitive-data redaction, bot protection, and rate limiting. Drop
Frequently asked questions
How many open source rate-limiter projects are there?
This registry tracks 3 projects tagged rate-limiter, with 16,884 GitHub stars between them. The most-adopted is resilience4j at 10,763 stars.
Are these rate-limiter projects free to use?
Yes — 2 of the 3 carry an explicit open-source licence across 1 distinct licence, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which rate-limiter 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 rate-limiter projects still maintained?
3 of the 3 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.