Elips is mainly developped with the OpenSource IDE Eclipse (eclipse.org) with the plugin Sysdeo Tomcat.
The current version of Elips has been developped with Tomcat 4.1 and then 5.0, Eclipse 2.1.2. The plugin which have been used are Lomboz for Jsp editing, SCP Link to be able to update the sourceforge home page (this one for instance ), JSEditor for editing javascript, and of course CVS
The sources available on sourceforge are the image of the Eclipse project. Normaly, there is only to open the project with Eclipse with the right plugin in order to be able to develop Elips directly.