weval is a WebAssembly partial evaluator that transforms interpreters into compilers using the Futamura projection technique. It's designed for developers working with WebAssembly who want to optimize interpreter performance by specializing functions and generating ahead-of-time compiled code. The project is particularly useful for those looking to achieve significant speedups in WebAssembly applications, as demonstrated by its use in providing 3-5x performance improvements for JavaScript execution in the SpiderMonkey interpreter.