I love the site, currently playing through various mods on various profiles. Some thoughts, for myself mostly:

• Laura's Bondage Shop - Awesome, BDSM themed but consensual.
• Slaverun - BDSM, player slavery, non-cons, very brutal. As I end to let this sort of thing get into my head I will probably never get far into this especially as the 'good' end is apparently underwhelming.
• Captured Dreams - I played from CCAS Slave start. The option on the ship to earn enough to pay off debt leads to getting a collar and belt, some very basic equipment and a debt of over 20,000 septims. I paid it off, was not real scene though. The lowly slave option puts you in a mine, doing nothing leads you to have to take ores to a smelter, then doing nothing or failing to meet quota puts you outside with Raccan offering you to passers-by. There seems to be an end - a 'bad end' but my playthrough seems to be broken - investigate console commands to progress? Otherwise excellent though progress is slow and boring, befitting the life of a lowly slave. Unfortunately the mod author has retired.
• Shout Like a Virgin - fun, unlike CD above you can continue to play normally albeit with some differences - having sex with Standing Stones, Word Walls and encountering Nocturnal who uses me as her torture bitch - very well done, seems to be a lot of content playable alongside main game.  Nocturnal is appropriately unpleasant though I fear the mod will not allow me to have any sort of payback.
• Submissive Lola - great fun but buggy perhaps as it is old - mod author has moved onto SSE. Was entirely consensual.
• Lich Evillyn - mostly a mod you suffer through rather than play, very unpleasant and triggering, though that is in the description. Also unfinished as mod has gone to SSE. 
• Maria Eden - not yet tried - consensus seems to be that it is old and no longer works very well but I may try it.
• Paradise Halls - not yet tried - a series of mods from what I have seen, focusing on PC as Domme/slaveowner.
• Devious Followers - played it a bit but there's now a new version, still a few bugs.
• Deviously Enslaved - installed but it conflicted so I removed it, there's now a new version. Allows people to 'know' PC is bound and react accordingly.
• Simply Slavery Plus - PC can be auctioned off to various other mods, very clever and well done. More of an interface than a quest mod.

May add to this, especially if I find a more consensual BDSM mod, if I had more time I would attempt to create a mod where you were bought by people who are basically decent but live in a world where slavery is rife.

  For instance an old alchemist lady who has spent her whole life researching and learning, and realises all her knowledge will be lost when she dies, so buys the PC to fetch ingredients, make deliveries maybe, and learn alchemy - have her tell PC how to make 'good' ie high value potions. Quests could perhaps incorporate the 'White Phial' quest from the main game.

  Also that weird idea I had about being bought by a spoiled rich young brat and her older wiser guardian - she treats PC badly, she wants adventure and buys PC as basically a tank for her and her guardian. Over time/quests she grows as a person eventually freeing PC.

  Also again (after playing Slaverun a little bit!) I had an idea about the PC herself ending up owning a slave who is completely traumatised - PC can keep her (slave would probably have to be female) as effectively a mindless thing or help her pass through the trauma - quest stages would be that she starts out rarely speaking at all, referring to herself as it. After a period of being treated well she starts to use 'I', then begins to show fear at being in dangerous situations, allowing you to tell her to stay with a housecarl, eventually remembering her life before being enslaved - maybe a revenge quest? She could re-learn skills she had before by the PC bringing her skill books, allowing PC to mold her into the follower they want.

  Feels good to have all that out of my head!