metaDSL provides a framework which eases creation of BNF grammars, parser generators and code generators. Executes as a Maven plugin or from the command line via a lightweight launcher powered by Maven runtime. See also: http://www.metadsl.com/
Javast is a Java API for creating an Abstract SyntaxTree of java source code (the equivalent of an XML DOM) in memory and then writing this to a file or bytestream as formatted source code.
It is mainly useful for java code generation.
A very simple web based IDE primarily for Java. The IDE provides a source tree, text editor with syntax highlighting, CSS for look and feel, and ant support. Future enhancements include subversion support. Uses Google Web Toolkit. Requires Javascript.