I really like Crystal. It’s something like “compiled Ruby”, so very nice and clean syntax, but statically type-checked and compiled. Only played around with it a bit, but that was already fun (nice type system, macros, simple C-bindings, …). There’s also more and more libraries available, see e.g. Awesome Crystal.
But if you’re on Windows it’s not ready yet for prime time (at least natively):
The Crystal compiler doesn’t run on Windows yet . But Crystal can be used with the Windows Subsystem for Linux, a compatibility-layer for Linux executables running natively on Windows 10.