Dex to Java decompiler
Decompiler from Java bytecode to Java, used in IntelliJ IDEA
The Ballerina Programming Language
Manifold is a Java compiler plugin, features include Metaprogramming
Transcribe Parsing Expression Grammar into a parser written in Java.
JPHP - an implementation of PHP on Java VM
An open source Java decompiler Gui for Procyon
A Proof of Concept for programming in English