Program: AstroGrep
License: GPL License
Website: http://sourceforge.net/projects/astrogrep/
Description: AstroGrep is A Microsoft Windows GUI File Searching (grep) utility. Features include regular expressions, versatile printing options, stores most recent used paths and has a "context" feature which is very nice for looking at source code.
Other: It appears to be a single executable and doesn't have an installer. It may only need a wrapper to put it in the Portable Apps Format.