First one is too dark,i can't see anything.The second looks like a snail or something has been having lunch.The third,i don't know what it is,but i do see little green pieces that you could salvage and start over with..

First could be Echeveria pulidonis...I don't see any soil?

Second perhaps echeveria too, different one, probably chewed on by a rodent (I see teeth marks); also hardly any soil, too deep inside of the pot and the center of rosette seems to be rotting?

I can't ID the cacti, but I think some branches/arms are blooming? I have seen photos of similar color (I thought it was dry...), but there are some dead parts there too.

How do you water - how often and how much? Are they in full sun (looks like outdoors)?

I believe that all need to be repotted asap into a well draining mix.

The poor cactus was under the hummingbird feeder and got wet but it is still trying and puts on new growth and flowers... but is basically rotten. Going to try to save it by repotting it?? The Echeverias(thank you for telling me what they are) are probably being eaten by the rats or the squirrels and as someone noted...both are rotten so I did try to repot them yesterday in dry cactus soil. Hope they all survive. Thank you all, very much!!!

Do you think I could start over with one arm of the poor cactus?? How do you do that? Thanks!!!

I hope someone that grows cacti will respond (I have only 3...). but I believe propagation would be similar to other succulents. Cut 'till healthy flesh is visible, let callus, insert into gritty mix. I see some new growth on few arms, those could be propagated too I believe? - if the 'arm' is dying, just take the new growth off, sit on top of gritty mix. If the arm is healthy, I would keep it with new growth on (at least few).

Wait for others to respond...

I have a few cacti and i just pick up the healthy pieces and lay them on the soil,and they tend to root with no problem.