ice is a track changes implementation, built in javascript, for anything that is contenteditable on the web. Conceived by the CMS Group at The New York Times, ice has been piloting successfully for articles written in the newsroom.
AJAXSLT is an implementation of XSL-T in JavaScript, intended for use in fat web pages, which are nowadays referred to as AJAX applications. Because XSL-T uses XPath, it is also an implementation of XPath that can be used independently of XSL-T.