There are several known re-implementations of ninja:

• llbuild: build system used by Xcode and the Swift Package Manager which can also build Ninja manifests
• n2: n2, an alternative ninja implementation in Rust
• nin: Nin is an experimental fork of ninja translated in Go
• ninja.py: Minimal Python implementation of ninja
• pyn: pyn is a Python-based implementation of Ninja
• samurai: ninja implementation in C for POSIX systems
• shake: build system written in Haskell that supports ninja evaluation
• turtle-build: Ninja-compatible build system for high-level programming languages written in Rust