Here are some useful programs I use:

console utilities/programs:

• zoxide: memorizes which directories you cd into, so you can later type shorthands for them

• procs: modern replacement for the ps command. basically lists your processes

• neofetch/fastfetch: displays your system info in a fancy way. 99% Linux users use that

• inxi: displays detailed system info but in a less fancy way. people usually attach the output of inxi -Fxz to a forum post where they need help troubleshooting

• asciinema: cool program that records your terminal sessions as text files

• agg: converts asciinema recordings to gif

• yt-dlp: insanely powerful youtube downloader (remember to only download things you are permitted to!)

• sl: ragebait when you misspell ls

• yazi: fancy file manager with image previews! minimal or no configuration required

• cava: audio visualizer. when you press f it cycles colors!

• htop/btop: you already mentioned. task managers basically

• ncdu: interactively shows disk usage per file

GUI apps:

• qalculate: very powerful calculator (has both qt and gtk frontends)

• gparted: probably the best gui disk management tool so far

• localsend: send files locally over wifi direct

• blueman: gui bluetooth manager

• freetube: awesome youtube client (NOTE: against youtube terms of use!)

• baobab: gui disk usage analyzer

• cheese: photo taking app with funny effects