* [Mockzilla v2.7.0](https://github.com/mockzilla/mockzilla) – OpenAPI-based mock server that generates realistic responses, validates requests, simulates latency and errors, and proxies with automatic mock fallback.

* [Hoppscotch 2026.5.0](https://github.com/hoppscotch/hoppscotch) – Lightweight API development ecosystem with real-time request sending and customizable theming.

* [Keploy v3.5.56](https://github.com/keploy/keploy) – Developer-centric API testing tool that creates tests and built-in mocks faster than unit tests.