The IronMeta parser generator provides a programming language and application for generating pattern matchers on arbitrary streams of objects. It is an implementation of Alessandro Warth's OMeta system for C#.
AustenX is a parser (code) generator for Java. It builds parsers based on a Parsing Expression Grammar framework.
A query analyzer that parses Redis' MONITOR command for counter/timing stats about query patterns.
A secure Linux system with Grsecurity and many penetration tools.