I've come across a lot of cool Addons that sadly don't get much attention because they only serve 1 really small purpose.
I want to start a thread were people will check out some smaller Addons and maybe think:
"hey that's cool and helpful, I never thought of that!"
Just post a link and name of the addon of your choice and maybe explain it in a few words or why do you like it.
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My addon of choice would be
EasyWorldMarker
It's a really simple worldmarker creator which is mostly only possible with chat commands (/wm 1 and such), if you use different UnitFrames and don't have the BlizzardRaidManager anymore.