I use many CLI tools.
tldr - Collection of simplified and community-driven man pages.
Awesome jq - Curated list of awesome things built with the JSON processor and turing-complete functional language jq.
One Things Well blog - Weblog about simple, useful software.
Terminals Are Sexy - Curated list of Terminal frameworks, plugins & resources for CLI lovers.
Inconsolation - Adventures with lightweight and minimalist software for Linux.
Arabesque - Systems, Tools, and Terminal Science.
cheat - Allows you to create and view interactive cheatsheets on the command-line.
hyperfine - Command-line benchmarking tool.
uutils coreutils - Cross-platform Rust rewrite of the GNU coreutils.
Structured text tools - List of text-based file formats and command line tools for manipulating each.