Alternatives to the grep command — altbox

ack

A grep-like tool optimized for searching source code, skipping VCS dirs and binaries by default.

Perl Artistic license
ag

A code searching tool similar to ack, with a focus on speed.

C Apache-2.0 license
gron

Makes JSON greppable

Go BSD-3 license Works with JSON
ripgrep

Extremely fast line-oriented search tool that respects .gitignore rules.

Rust MIT license