* [TestProf v1.6.0](https://github.com/test-prof/test-prof) – Collection of tools to analyze and optimize Ruby test suite performance.

* [FactoryTrace v3.0.0](https://github.com/djezzzl/factory_trace) – Finds and reports unused FactoryBot factories and traits.

* [mutant v0.15.1](https://github.com/mbj/mutant) – Ruby mutation testing framework that modifies code to confirm tests catch defects.