Mint, I'm sure it's a type of Argentine Giant, not sure of the cultivar buy it will have beautiful white tubular and slightly fragrant flowers that only last until the next morning:(. I would put it in a larger pot.

Top right probably is some sort of South American columnar, but which one? Cereus......

Faked flower one is likely the same as #1

#3 may be a Parodia / Soehrensia, nexrt to it some sort of cactus / euphorbia

#5 is a Mammillaria

I likely don't need to tell you this, but they need more light.

The round one on the middle shelf is shaped a lot like a Golden Barrel cactus. It might be one with some old flowers. One of my favorites! They can get big.

The one in the white pot is cephalocereus senilis; the tiny one on the middle shelf is echinopsis peruviana; the yellow pot is echinocactus grusonii; I know the two up top are the same type, I just don't know which one. I will follow up on the ID suggestions given. I'll also look for a larger pot- thanks, Nick.

Nick, those are good IDs, if you actually had those plants, but those are not the plants you think they are. You have no Cephalocereus or Echinocactus there.

Yes, it is a golden barrel! The brown stuff is from the pine tree, I got most of it out, but those spines are formidable!

Small white pot at the bottom, maybe Mammillaria hahniana.