ripgrep is a command line search tool that combines the usability of The Silver Searcher (an ack clone) with the raw speed of GNU grep.

rare is described as 'Fast, realtime regex-extraction, and aggregation into common formats such as histograms, numerical summaries, tables, and more!' and is an app. There are nine alternatives to rare for a variety of platforms, including Linux, Mac, Windows, BSD and Self-Hosted apps. The best rare alternative is ripgrep, which is both free and Open Source. Other great apps like rare are grep, ugrep, The Silver Searcher and ack.
ripgrep is a command line search tool that combines the usability of The Silver Searcher (an ack clone) with the raw speed of GNU grep.

grep is a command-line utility for searching plain-text data sets for lines matching a regular expression.

A user-friendly, faster, more capable grep replacement. Includes a TUI, Google-like Boolean search with AND/OR/NOT, fuzzy search, hexdumps, searches (nested) archives (zip, 7z, tar, pax, cpio), compressed files (gz, Z, bz2, lzma, xz, lz4, zstd, brotli), pdfs, docs, and...

Silver Searcher is a code search tool similar to ack that claims to be much faster. It's implemented in C and has some extra features such as ignoring files per .hignore, .gitignore contents.
Ack is designed as a standalone (one perl file) replacement for 99% of the uses of grep. ack is intelligent about the files it searches. It knows about certain file types, based on both the extension on the file and, in some cases, the contents of the file.


App::Rak provides a CLI called rak that allows you to look for a pattern in (a selection of files) from one or more directories recursively. It has been modeled after utilities such as grep, ack, ag and rg, with a little bit of find mixed in, and -n and -p parameters of many...
The program combines the power and flexibility of traditional command line grep utilities available on DOS, UNIX and other platforms with the ease of use of Microsoft Windows.

Zoekt is a text search engine intended for use with source code. (Pronunciation: roughly as you would pronounce "zooked" in English).