ripgrep - ripgrep combines the usability of The Silver Searcher with the raw speed of grep.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
dnGREP - dnGrep allows you to search across files with easy-to-read results.
iTerm2 - A terminal emulator for macOS that does amazing things.