Groovy's new home
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Frege is a Haskell for the JVM. It brings purely functional programing to the Java platform.
An ultra-lightweight Python interpreter that runs with only 4KB of RAM, zero dependencies. It is ready to use out of the box without any configuration required and easy to extend with C. Similar project: MicroPython, JerryScript.
JPHP - an implementation of PHP on Java VM
GoJava - Java bindings for Go packages