Mewt

Mewt is doing something that barely anyone in the dev-tool space cares about but totally matters: mutation testing for languages like Solidity and Rust that usually get skipped over. It uses Tree-sitter — which is the right call, honestly, since it parses code the way compilers do — and SQLite to keep track of test campaigns, which is simpler than spinning up some heavy database. The fact that it’s open source and language-agnostic means anyone running tests on non-mainstream chains can finally see if their test suite actually catches bugs or just exists to look busy. This is the kind of project that solves a real problem almost nobody is building for.