"iotop -o" is also useful, for seeing if that process is actually writing to disk

powertop is a great utility for improving laptop battery life - it highlights the things you need to adjust to reduce power usage

pgtop for postgres, but I've never used it

not "top"-branded, but lnav is an ncurses-based log navigator that's partially comprised of magic

and, of course, there are many varieties of "desktop" cough