Here are a bunch of different sites built on steem.io my friend and I have found :D
If you guys like busy.org dont forget to check out some of the other steem.io interfaces :P If you find some new ones I'd love to hear about them!

https://steemit.chat (Come along and join Steemit chat rooms or just message other users directly. Be Weary of scammers and don't give out any of your keys!)

https://dmania.lol/hot (Create memes and get rewarded through the steem.io blockchain)

https://www.dlive.io/#/ (Live streaming on Steem! Only Supports OBS)

https://dsound.audio/#/feed (Audio file posting service)

https://d.tube/#! (Video Posting service)

http://steemstory.com/@UsernameHere (Your story here on Steemit.com made by Hive account@roelandp)

http://steem.supply/@UsernameHere (Check when you are getting your reward payouts)

https://steemworld.org/@UsernameHere (check out all different sorts of useful stats)

http://www.steemreports.com/ (So called comprehensive steem reports to help you understand things)

https://anon.steem.network/ ("Anonsteem beleives everyone has a right to privacy. So create a Steem account using BTC or LTC or Steem." Do your checks first! Comes with a .onion portal)