Yep, there are many other languages that can be compiled to javascript:

Ocaml to javascript compiler: http://skydeck.com/blog/programming/ocamljs-ocaml-to-javascr...

Haskell to javascript compiler: http://www.haskell.org/haskellwiki/Yhc/Javascript

Haxe to javascript compiler: http://haxe.org/doc/start/js

ECMAScript4 to (classic) javascript compiler: http://ecmascript4.com/

Java to javascript compiler: http://code.google.com/webtoolkit/documentation/com.google.g...

I'm sure there are others as well.