HotRuby is Ruby on JavaScript and Flash.

HotRuby runs opcode, compiled by YARV(Yet Another Ruby VM) on Ruby. To be precise, HotRuby is Ruby VM on JavaScript and Flash.

Most of the grammars are implemented. However, exceptions are not implemented. Most of the build-in functions and build-in classes are not implemented.

Please see http://hotruby.accelart.jp/ .