A list of modern command line tools that I find useful:

z - jump around
cht.sh - unified access to the best community driven cheat sheets repositories of the world.
tldr - collaborative cheatsheets for console commands
bat - a cat(1) clone with syntax highlighting and Git integration
ripgrep - a line-oriented search tool that recursively searches the current directory for a regex pattern
fzf - a general-purpose command-line fuzzy finder
httpie - human-friendly CLI HTTP client for the API era
cloc - count lines of code