Unknown 15- Echinocactus texensis
Unk. 20- Stenocereus pruinosus
Unk. 38- Opuntia microdasys
Unk. 48- Pachycereus pringlei or Pachyereus pecten-aboriginum
Unk. 62- Myrtillocatus geometrizans
Unk. 73- Astrophytum ornatum
Unk. 77- Cereus tetragonus "Fairy Castle"
Unk. 79- Notocactus leninghausii
Unk. 80- Hylocereus, probably undata
Unk. 84- Agave ferdinand-regis

#3 Looks like Mammillaria camptotricha
#5 Mammillaria, possibly heyderi
#12/13 Mammillaria
#16/17/18 Mammillaria elongata
#23/24 Parodia tabularis? (formerly Notocactus)
#25/26 Parodia mammulosa (formerly Notocactus mammulosus)
#29 Opuntia microdasys
#30/31/32 Mammillaria
#36 Haworthia attenuata
#37 The one on the far right looks like H. limifolia, two on the left H. attenuata
#39 Stapelia?
#40 Mammillaria
#41 Possibly Parodia tabularis
#43 Looks like a Mammillaria, possibly densispina
#46 Cryptocereus??
#50 Aloe; could be ferox, marlothii,....
#60 Thelocactus (Hamatocactus) setispinus
#64 Kalanchoe daigremontianum X tubiflorum ?
#65 Gymnocalycium mihanovichii v friedrichii cv 'Hibotan'
#74 Echinocactus grusonii seedling
#80 Hylocereus undatus

Your plants could use some more light. Repost some more pics of them in a few months growing under stronger light.

Regards

Cochemiea

Hi,
These are my opinions about the Id's of your plants:
71, 72 and 73: Astrophytum ornatum
74: Echinocactus grusonii
79: Notocactus leninghausii
65: Gymnocalycium mihanovichii cultivar, will die soon if not grafted as it doesn't contain chlorophyll
62: Myrtillocactus geometrizans
40: Mammillaria rhodantha or related
28, 29, 38: Opuntia microdasys
25, 26: Notocactus sp.
16-18: Mammillaria elongata

And the same remark as given above: your plants need SUN!!!!! Cacti are no houseplants.

hey, thank you for all your ids, very helpful, the red cacti pieter was talking about, is already grafted, i just buried the graft to make it look better.

That might not be such a good idea. Buried, or almost buried, grafts are used on some plants to give them a more natural appearance, but only where the graft has been used to replace roots that are sensitive to rot, or to speed up growth. In your case, the stock is the only source of photosynthesis and the plant will die if it is not exposed to light.

67 Crassula
66 Haworthia
38 Opuntia
14 Ferocactus latispinus
10,11 Echeveria
9 Agave
Indoors, give as much direct light as you can, keep dry for the winter, and keep cool if possible. After danger of frost, move outside, and gradually increase light levels.