ripgrep - ripgrep combines the usability of The Silver Searcher with the raw speed of grep.
fzf - A command-line fuzzy finder written in Go
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
fzy - A better fuzzy finder
dnGREP - dnGrep allows you to search across files with easy-to-read results.
Percol - OS & Utilities and Development