My list of best Steem websites/apps is as follows:
Steem-based Websites/Apps
Following 2 websites list about the latest pieces of websites and apps that are being developed on Steem Blockchain:
https://steemprojects.com/
http://steemtools.com/
Steem Wiki
Steem Center- https://www.steem.center/ is a great website to understand end-to-end about the Steem Blockchain and its related items.
Steem Bounty
https://steem-bounty.com and @steem-bounty is a unique way of rewarding users besides what Steem has to offer.
Steemit Reddit Channel
https://www.reddit.com/r/steemit/ is a great place to discuss about Steemit on Reddit. It is usually quite active over there.