stryker-mutator / stryker-js

Mutation testing for JavaScript and friends

infection / infection

PHP Mutation Testing library

mbj / mutant

Mutation testing for Ruby. AI writes your code. AI writes your tests. But who tests the tests?

stryker-mutator / stryker-net

Mutation testing for .NET core and .NET framework!

hcoles / pitest

State of the art mutation testing system for the JVM

boxed / mutmut

Mutation testing system

sourcefrog / cargo-mutants

:zombie: Inject bugs and see if your tests catch them!

mull-project / mull

Practical mutation testing and fault injection for C and C++

AmazingAng / old-coder

An old coder's strategy for the agent era: don't read the code — make it run the gauntlet. Evidence-first development skill for coding agents, inspired by Uncle Bob.

sixty-north / cosmic-ray

Mutation testing for Python

pliablepixels / gap-trap

Turns vibe coding into high quality code. Sets up rules and gates in your repo so AI-written code stays correct without you reviewing every line.

tdaylan / NoiseScope

A control instrument for handshake state machines - lint protocol models, replay transcripts, and fly deterministic mutations until a trace diverges.