SteemNow
https://www.steemnow.com/@davidconstantine
One of the first websites I encountered, and still one of my favorite:
My top usage for it is how much SP I have and when it will be refilled.
Steem.Supply
http://steem.supply/@davidconstantine
This one is really a masterpeace, does in depth design.
Of your posts and comments, when exactly you going to be paid out...
The social insight is really unique feature I didn't seen at other places, you could see how much of your followers really following you and upvoting in a nice graph way
Steem World
https://steemworld.org/@davidconstantine
This is just a crazy and beautiful UI, the amount of features may overwhelm you, but you for sure will find almost everything you can think about, there.
Know about others? let us know :)