Nim has multiple backends and is relatively mature. It’s fairly readable as compilers go. There’s also a new experimental rewrite of the Nim compiler called Ni

Nim has multiple backends and is relatively mature. It’s fairly readable as compilers go. There’s also a new experimental rewrite of the Nim compiler called Nimony which targets a new intermediate called NIFC. That is intended to the be transformed to C, LLVM, JavaScript, etc.