A programmer-oriented testing framework for Java
A simple Bash IDE / Debugger
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
Java framework that allows you to unit test code normally
Bytecode to source converting Java & Kotlin code into JavaScript, C++
Marathon supports testing of Java/Swing and Java/Fx applications.
Vector drawing program for LaTeX using PSTricks
JPHP - an implementation of PHP on Java VM
Java5 mobile agents in peer2peer containers without stubs/skeletons.
Free and open-source style and grammar editor
HL7 Inspector is a tool for managing HL7 messages
An IDE for Clojure
A continuation of the popular Artemis ECS framework
Programming in MS Paint
A lightweight programming environment for Java
PUed - PlantUML Editor
Lightweight, fast, Java-centric Lua interpreter
Decodes PeopleCode bytecode and submits the code to SVN or Git
Java bytecode editor
Fibers, channels and actors for the JVM
vi vim plugin for netbeans