There are 28 active ones as per the Overview thread.
Now there are more than 30 active Bitcoin campaigns on the forum, here is the full list:
1. Crypto.Games
2. BestChange
3. FreeBitco.in
4. Roobet.com
5. Betcoin.ag
6. Duelbits.com
7. Stake.com
8. Rollbit.com
9. FortuneJack.com
10. BK8
11. TrustDice.win
12. LiveCasino.io
13. SINBAD
14. Coinomize.biz
15. Yo!Mix
16. UniJoin.io
17. AgoraDesk.com
18. vbetFTN.com
19. Utopia P2P
20. MixTum.io
21. BC.Game
22. l0tt0.com
23. Mixin Safe
24. 0xBET
25. Bitsar
26. Moneypot
27. eXch.cx
28. Mixero.io
29. Zenland
30. CoinRoyale
31. COINS.GAME
32. Nitrobetting.eu