This started as a list of ponzi schemes only, but I've also found some pyramid schemes, (and quite a few that I think are both), so I've added them here as well. The ponzi and pyramid schemes currently around (that I'm aware of) are:
1. BCC Cash (note that this is different from Bitcoin Cash)
2. BCHconnect
3. Billion Bit Club
4. Binary Coin
5. Bit Sequence
6. BitAI
7. Bitchamps
8. Bitclub/clubcoin
9. Bitcoin Ascension (pyramid scheme)
10. Bitconnect X
11. Bitether
12. Bitfinite
13. Bitfintech
14. Bitglare Coin
15. Btchash
16. Btc-Rush
17. Btcwait
18. Chrysos
19. Coinrium
20. Cointeum
21. Coinspace
22. Dascoin
23. Davor
24. DagCoin
24. Ecomcash
25. Eigencoin
26. ETHconnect
27. Etherbanking
28. Exacoin
29. Falcon Coin
30. Farstcoin
31. Ficoin
32. Firstcoin
33. Forzacoin
34. Futurecoin
35. FUU Coin
36. Gold Reward Token
37. Goldgate
38. Hedgeconnect
39. Hextracoin
40. Home Block Coin
41. HotCrypto
42. Hydrocoin
43. Ibiscoin
44. iCenter
45. Ideacoin
46. iFan
47. Iotaconnect
48. Knox Coin
49. Legendcoin
50. Lendconnect
51. Lendera
52. Libra Coin
53. Liteconnect
54. Loancoin
55. LoopX
56. Martcoin
57. Moneroconnect
58. Monetize Coin
59. Monyx
60. Neoconnect
61. Numiv
62. Oalend Coin
63. Onecoin
64. Pagarex
65. Purpose/DUBI
66. Regalcoin
67. Rothscoin
68. Secular Coin
69. SFICoin
70. Steneum
71. Stepium (pyramid scheme)
72. Swisscoin (pyramid scheme)
73. Tenocoin
74. TEX Coin
75. Thorn Coin
76. Ucoin Cash
77. Unix Coin
78. USI Tech
79. WCI
80. Western Coin
81. XRPconnect
Defunct ponzi schemes:
Ambis
Bitcoinly
Bitconnect
Bithaul
Bitlake
Bitpetite
Bitsupreme
Btcbox.cc
Chain.Group
Coinreum
Control Finance
Cryptodouble
Ethtrade
Laser Online
Mavro
Mecoin
Metizer
Microhash
Paycoin
Plexcoin
Thunderbit
Vixice
Vone
Note that the above coins/services are only ones that I think are very likely to be ponzi/pyramid schemes (it's difficult to be 100% sure). There are many other scams out there, but I haven't included them here because many of them are controversial, so deciding with great certainty if some are scams would be much more difficult, and because making this post is already a lot of work.
UPVOTE and SHARE to inform all the comunity ! COMMENT HERE with other coins wich is not on my list ! Help people to stay away from SCAMMERS !
Onecoin-Onelife should occupy the rank number 1 !