Thursday, October 26th, 2006p>WebTTY is a GPL project that lets you shell in via Ajax:
The WebTTY package allows any Linux terminal processes to be controlled in a text area HTML element on a webpage. The output from the server process is collected on server side, and is send to a text area element. Keypresses in textarea are collected on client side and send to the server process. WebTTY uses AJAX/DHTML patterns to achieve in-page updates without refreshing the entire page.