Compile JavaScript from CoffeeScript with options and notifications - dopustim/atom-coffee-autocompile ...

Higgs, an experimental JavaScript engine written in D, uses novel approaches to speed up JavaScript -- and could inspire similar projects An experimental new JavaScript compiler could provide ...

Emscripten C/C++-to-JavaScript project uses a back-end derived from LLVM for greater speed and a more dedicated compiler.

Mozilla beefing up JavaScript performance with new JIT compiler IonMonkey JavaScript will debut with Firefox 18 in early 2013.