dnGREP

Program: dnGREP
License: OpenSource - GNU v 3 License
Website: http://code.google.com/p/dngrep/

Description: .NET implementation of GREP tool with GUI (works on Windows only). Supports plain text/regex/XPath search (including case-insensitive search), file move/copy/delete actions, undo functionality, optional integration with text editor (like notepad++) as well as bookmarks (ability to save regex searches for the future).

Other: Does not write any entries in registry and stores bookmark in the same folder as primary executable. Window persistence settings (as as last search string used and states of checkboxes), however, are stored in "C:\Documents and Setting\..." folder. Those are not critical for application performance, however it makes this application not 100% portable.