Here is a review of services developed around steem(it).
link: http://steemtools.com/ or on Steem App center on the menu

Steemd.com

My favorite. You have access to all the actions made on steem blockchain. For instance you can check my activity. That's when you remember that everything is public on this blockchain.

Steemit.chat

I personally don't use because I won't take the time to do it. In the beginning it wasn't an official endorsed service I guess that why I didn't like it. I don't like the fact that there is no obligation, via cryptography for example, to reuse your steemit username (which I find necessary). It seems to be pretty active. Who knows I might change my mind.

Steemit Notifications

Well unfortunately I don't use chrome but this functionality is clearly missing:
https://steemit.com/steemit/@fleuri/steemit-notifications-browser-extension-download-now

Steem IQ

http://steemiq.me/ helps you check "how well you write". I don't specially trust the number but it was fun to check.
Helpful for everyone I guess

Random/ next popular posts

If you are tired of your feed and want to discover some random or hidden gems you have different options:
http://steemups.com/
http://steem.link/Steemit-Random

Lottery

http://steemloto.com/ Although I don't recommend paying to play (more on that on a following post) on steemit, if you feel lucky this one is for you.

Squeek: twitter like on steemit

https://squeek.io/
This one is my contender. I think I am going to play with a bit.
Although the 4 posts per day might be a limit, I think the bandwagon will be fill up once it becomes trendy. I am betting on this one.

steemdollar

This one provides different services you can check the conversion rate : http://www.steemdollar.com/ .
You can also check if you posted too much today : http://www.steemdollar.com/limitstatus.php?name=cryptohazard

So that's it for the review. The ecosySteem is growing.
I will do more reviews if there is interest.

cryptohazard