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' and is an app. There are more than 25 alternatives to Rummage for a variety of platforms, including Windows, Linux, Mac, Chocolatey and Web-based apps. The best Rummage alternative is grepWin, which is both free and Open Source. Other great apps like Rummage are AstroGrep, dnGREP, grep and ugrep.
A very capable Windows Grep, search, replace and data extraction tool.
String Replacer for Mac allows to find and replace a list of strings inside files and folders directly or in batch mode. It allows to operate on multiple files using a multiple string couple replacement list. It works with just a single click or using drag and drop.
KFileReplace is a KDE utility that replace some strings with others in a lot of files in an only operation. Then it's very easy to update some URLs, filenames, ... which are written in all files of a project.
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