I nominate LuaJIT. Its only developer Mike Pall lives from sponsorship:

LuaJIT is the fastest dynamic language implementation I know. It is a source of inspiration for other JIT implementations, especially JavaScript virtual machines.

The LuaJIT FFI library is also the most advanced I know. It can basically parse C headers and allow you to call library functions with little effort. It also allows you to use native C data types in Lua.

Sadly few people are interested in LuaJIT, because few people code in Lua. But regardless of whether you do or not, odds are that the techniques used in LuaJIT will be used in other dynamic languages implementations in the next few years (it has already begun with eg. PyPy, V8...).
posted by [Old Forum guest] • 7 years and 2 months ago Link