DocBook Editing and Processing for Eclipse
yEdGen can open a flow chart and generate ANSI C code from it.
Light-weight Scintilla-based text editor with syntax highlighting
A PlantUML editor written in Qt4
Pure Trait-based Programming on the Java Platform
Cress is a comprehensive toolset for graphical service/workflow design
An assembler and disassembler for the JVM (Java Virtual Machine)
Semantic researcher networking
Clean, powerful templates for Java
Generator's generator (JSON templates plus automatic DSL generation)
Node.js & Java development in Eclipse-based IDE
Open source tools for control flow analysis of java programs
Annotation-triggered method call logging for your debug builds
Plugin based multi-purpose dev tool.