A reverse engineering suite (decompiler, editor, debugger and more)
A Java Virtual Machine for OpenJDK
JPEXS Free Flash Decompiler is open-source Flash SWF decompiler
Source code of APK Explorer & Editor (AEE), an open-source tool
Lightweight IDE for Java
Transcribe Parsing Expression Grammar into a parser written in Java.
JPHP - an implementation of PHP on Java VM
Best IDE for Beginners
A standalone Java Decompiler GUI
Java interpreter with Forth-like syntax, use it for testing java libs
A native Windows port of the GNU Compiler Collection (GCC)
C-Lesh is a game programming language for 2D games.