SunOne Studio
For Windows 95/NT, MacOS, Solaris, OS/2, and any other Java-enabled platform. Based on Netbeans. [Commercial and freeware editions]

The Java IDE
A Java IDE includes code editing highlight, code completion, debug and compile capabilities. Also built-in API help, framework code generator. [Shareware]

Vibe-Yet another IDE (VIBE)
An IDE that enables to automate the design and development of infrastructure components for complex distributed cross-platform, cross-language systems applications for DB, XML rendering, EJB 1.1 and Infor Bus like IBM MQ. [Free and commercial versions]

Visual Paradigm IDE for Java
A Java IDE includes code editing highlight, code completion, debug and compile capabilities. [Shareware, 180 days]

WebIDE
An experimental online development interface for compiling Java applets and applications. The current version offers editing, compiling, syntax highlighting and searching for help.