Rummage is described as 'cross platform tool for crawling directories and searching and replacing in text files. It is written in Python and uses wxPython for the GUI. Rummage allows for literal or regex searches and has configurations for limiting the files etc'. There are more than 25 alternatives to Rummage for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and BSD. The best alternative is grepWin, which is both free and Open Source. Other great apps like Rummage are grep (Free, Open Source), dnGREP (Free, Open Source), AstroGrep (Free, Open Source) and The Silver Searcher (Free, Open Source).
grepWin is a simple search and replace tool which can use PCRE regular expressions to search for strings of text within files. grepWin adds an entry to the shell context menu to easily search selected folders.
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.
regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions. If you need project-wide substitution and you’re tired of hacking sed command lines together, then you should definitely give it a try.
Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...