fun4j brings functional programming to the JVM. It's a framework that integrates major concepts from functional programming into the Java Platform. It also provides seamless integration of Java with Lisp coding, by using a lisp-to-bytecode compiler.
ArmedBear (ABCL) is a Common Lisp written in Java. Its compiler produces JVM byte code, tapping into the 'write once, run everywhere' philosophy of Java. J is a text editor written in Java featuring e.g. syntax highlighting and automatic indenting.