This collection of libraries implements a code indexing and querying system. It aims to be language agnostic, but currently only supports Java. It has rudimentary support for Scala, C#, ActionScript and other C-like languages, but not proper compiler integration like Java.
It mainly exists as a code indexing backend for the Scaled editor, but it is hopefully sufficiently standalone to be useful outside that context.
Naturally, there is no documentation, but take a look at the code in the test project to see how
to use it. It's not tremendously complicated.
This library is released under the New BSD License. The most recent version is available at http://github.com/scaled/codex