CodeBeagle
A tool to search source code based on a full text index
...To do so it creates a full text index of the desired source files. Because it is tolerant to whitespace its search syntax works great for searching source code. The search results are displayed in a source viewer with customizable syntax highlighting. It runs without installation and leaves you in full control when to update the index. Advanced features are the support of multiple search locations, extensible context menus and custom search scripts which allow to automate sequences of searches.
Project moved to GitHub: https://github.com/otengler/CodeBeagle