Are you a terminal freak too? And do you know the great work of Igor Chubin (https://github.com/chubin)?
curl cheat.sh - highly useful when you need to execute a command you use twice a year, don't remember the parameters and like me you don't like digging through man (example: curl cheat.sh/tar). And just discovered it supports also quick tips when you script something (like curl cheat.sh/python/read+file).
curl wttr.in or curl v2.wttr.in - when you don't want to switch to a different window to check the weather (pun intended).
curl rate.sx - currency converter (example czk.rate.sx/1eur).
By the way, all this is possible because of awesome curl by @bagder