JinnIde is a plugin that allows using Jinni Prolog, now also hosted here on this site (with open source license!), within the confines of an IDE integrated in JEdit.
Jalopy is a source code formatter/beautifier/pretty printer for the Java programming language. It is aimed to provide a full-featured, yet free alternative to the well-known Jindent. Plug-ins for Ant, Eclipse, IDEA, JBuilder, JDeveloper, jEdit, NetBeans.
This is a jEdit completion-code plugin for php. It parses the working file, the included/required files if they are reacheable, builds an object oriented representation of the code, and then popups a window with the suggestions.
A refactoring tool for the Java programming language, it includes the JavaStyle pretty printer, a UML java class diagram viewer, a coding standards checker and computes program metrics. Plugins for jEdit, Netbeans, JBuilder and other IDEs available.