Recommended VM version: Ruby 1.9.1-p0 == HotRuby HotRuby is Ruby on JavaScript and Flash. HotRuby runs opcode, compiled by YARV(Yet Another Ruby VM) on Ruby. To be precise, HotRuby is a Ruby VM on JavaScript and Flash. I recommend using Ruby 1.9.1-p0, the newer versions have been giving trouble. Most of the grammars are implemented. However, exceptions are not implemented. Most of the built-in functions and built-in classes are not implemented. == News Now using Ruby 1.9.1, but broke some things migrating over. Works with jQuery! == Mission Statement: To provide a JavaScript VM for the Ruby language to support legacy browsers. Legacy browsers don't handle <script language="text/ruby"> tags, but they do support JavaScript. In order for developers to be free to use Ruby as a web based scripting language they need to be certain that their code will run on as many platforms as possible. HotRuby will enable using Ruby on all major browser platforms. == Github? It was developed by yukoba ?, the official website is at http://hotruby.accelart.jp/. The original repository is at http://code.google.com/p/hotruby/, but it seems to be abandoned. Github to the rescue!