Awesome
PT.PM (PT Pattern Matching Engine)
PT Pattern Matching Engine, or PT.PM, is an engine for searching patterns in the source code. PT.PM is based on Unified Abstract Syntax Tree (UST). At present time C#, Java, PHP, PL/SQL, T-SQL, and JavaScript are supported. Patterns can be described within the code or using a domain-specific language (DSL).
Build Status (Windows & Linux)
Artifacts are also available.
Documentation
See a Wiki and articles at PT.Doc.