Apache NetBeans
RStudio is an integrated development environment (IDE) for R
IntelliJ IDEA & IntelliJ Platform
The IDE for competitive programming
AndroidIDE is an IDE for Android to develop full featured Android apps
Next-gen container development platform, workspace server & cloud IDE
Kisekae UltraKiss is a full featured integrated development environmen
Learn Java the easy way!
A syntax highlighting, code folding text component written in Swing
Static site IDE is a Static Site Generators aka Static Site Editor
Launch an external diff tool like WinMerge in Eclipse
Lightweight IDE for Java
EditBox is the Eclipse plugin for source code background highlighting.
Source code for the processing core and development environment
Programming in MS Paint
Vim-like editing in Eclipse
ZKCC is a netbeans java code completion plugin for zul files.
Literate programming for eclipse