Steemit.com, ChainBB.com, Busy.org
It's all OFFICIAL and Authentic Steem Blockchains and Platforms. There is a lot OFFICIAL TOOLS as well.
We are starting some NON-OFFICIAL PUBLIC and not just tools, but whole Platform :D
It's open source for all as well. So if you're developer you can make more :)
Hope i was clear enough.
Lucifer