[httpie](https://github.com/httpie/httpie) is a modern, user-friendly command-line HTTP client - see also [http-prompt](https://github.com/httpie/http-prompt)
jq is a lightweight and flexible command-line JSON processor
yq is a Python wrapper for YAML/XML/TOML documents (documentation here)
yq is an identically-named portable command-line YAML processor written in Go (documentation here) - see also yq : A command line tool that will help you handle your YAML resources better
fd is a program to find entries in your filesystem. It is a simple, fast and user-friendly alternative to find
gron is a cli which helps make JSON greppable
jid is JSON Incremental Digger and it lets you drill down JSON interactively by using filtering queries similar to those supported by jq
duf is a disk usage/free utility or an improved 'df' if you prefer. It's also cross-platform
cheat allows you to create and view interactive cheatsheets on the command-line.
kubectx and kubens where kubectx is