Marathon supports testing of Java/Swing and Java/Fx applications.
Vector drawing program for LaTeX using PSTricks
A lightweight programming environment for Java
Map Generation Application and API
A free cross-platform editor for the DRAKON visual language.
A Processing/Java library for high performance GPU-Computing (GLSL)
Compile and run Java programs without using command mode!
DocBook Editing and Processing for Eclipse
yEdGen can open a flow chart and generate ANSI C code from it.
A PlantUML editor written in Qt4
Pure Trait-based Programming on the Java Platform
Cress is a comprehensive toolset for graphical service/workflow design
Clean, powerful templates for Java
Semantic researcher networking
Plugin based multi-purpose dev tool.