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.
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.
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.Discontinued
Official site has been replaced with few sentences of text without links thanking for the past 25 years. The program is safely downloadable at CNET aka Download.com.