Crystal
Statically typed language with Ruby syntax — as fast as C, as readable as Ruby.
static
compiled
since 2014
oopconcurrentsystems
Crystal gives Ruby developers a familiar syntax with static type checking and LLVM-backed native compilation. Type inference keeps code clean while eliminating entire categories of runtime errors. Its built-in concurrency primitives (fibers and channels) and zero-overhead C bindings make it suitable for high-performance web services and systems tooling.