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.

Zoekt is described as 'Text search engine intended for use with source code. (Pronunciation: roughly as you would pronounce "zooked" in English)' and is an app in the online services category. There are eight alternatives to Zoekt for a variety of platforms, including Linux, Mac, Windows, BSD and Haiku apps. The best Zoekt alternative is ripgrep, which is both free and Open Source. Other great apps like Zoekt 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.


UniversalCodeGrep (ucg) is an extremely fast grep-like tool specialized for searching large bodies of source code. It is intended to be largely command-line compatible with Ack, to some extent with ag, and where appropriate with grep.