Aptana Studio for Mac OS X v3.6.0

Aptana Studio is an open source IDE based on the Eclipse IDE for programming and creating web applications.

The program has numerous features made to help programming: code assist gives hints and tips for tags and syntax, the debugger tool aims to detect and list possible bugs in code and the program also has integrated preview browser (for Firefox and Internet Explorer for example).
Aptana Studio supports common web-application coding languages such as Javascript, AJAX, php and Ruby on Rails as well as HTML and CSS. With Aptana Studio you can also develop applications and programs for Apple iPhone. There are official forums for idea exchange and help at the Aptana website.