
FileLocator
FileLocator Lite enables you to locate files on your pc. It performs a thorough and quick search for any file you want to find. It is a free reduced functionality version of FileLocator Pro.
AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
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.
Portable File search Support for regular expressions
portable graphical-user-interface file-search regular-expression grep