Howtoforge posted a guide about installing Aptana AJAX Development Environment on Ubuntu

This tutorial shows how to install the Aptana IDE on an Ubuntu Edgy Eft system. The Aptana IDE is a free, open-source, cross-platform, JavaScript-focused development environment for building Ajax applications. It features code assist on JavaScript, HTML, and CSS languages, FTP/SFTP support and a JavaScript debugger to troubleshoot your code.

Installing The Aptana AJAX Development Environment On Ubuntu