Cress is a comprehensive toolset for graphical service/workflow design
Tool for parsing, verifying, browsing and converting EDIFACT and X12
A PlantUML editor written in Qt4
Java-based scientific graphics
a DSL for type systems, reduction rules, interpreters for Xtext langs
Embeddable/J2E/Desktop Java Wiki CMS
A lightweight ORM that does not require annotations.
Java utilities for byte streams, readers and format detection
Java RDF Framework
Serial Communication between Java and Arduino made simple.
JFig is a simple, powerful tool to manage application configuration
Java datastructures and algorithms extensions
Database explorer to MySQL, Oracle, Sybase & others. Source maker JSF.