AJAX console window with ANSI/VT100 support?

I'm planning to write gateway web application, which would need "terminal window" with VT100/ANSI escape code support. Are there any AJAX based alternatives for such a task?

I'm thinking something like this: http://tryruby.hobix.com/

My preferred backend for the system is Python/Twisted/Pylons, but since I'm just planning, I will explore every option.

From stackoverflow Harriv

• AjaxTerm has a terminal, with mostly felicitous terminal emulation, done on the Python backend (it just pushes display updates to the client Javascript).

  The AjaxTerm website has been down for some time, but you can still find it packaged in Debian.

  From ephemient

• Try

  AnyTerm

  AjaxTerm

  WebShell

  From Luis Melgratti

• There's also Shell In A Box.

  Harriv : Thanks, that looks interesting.
  From Alec Thomas