Zeta: Same as Epsilon but the ratios are fixed for portraits.

SDXL EPSILON: SDXL Delta with Cybernella's Amazing Portraits XL baked in, plus a couple of cinematic enhancers.

SDXL DELTA: I combined NQP 3.0 with NQE 3.0 and then I added some of Prodije's Fabled Illusion to the mix, since I like how it handled dark images.

SDXL 3: tends to be more photorealistic and a little better at SFW content that previous versions.

SDXL 2: A merge of NQP 1 and Juggernaut XL

SDXL: A merge of the SDXL Photoboobs checkpoint with a couple anime/art SDXL checkpoints. I'll probably make a new one - this one has a very high bias toward making white people over other races/ethnicities.

__
SD 1.5: v2.4: Was made with the Draw Things app back when Draw Things' checkpoints didn't always play nice with others. Avoid unless using said app.

SD 1.5: A veritable soup of checkpoints I should have catalogued. These are a few that got mixed and re-mixed until I found a checkpoint I felt comfortable sharing:

https://civarchive.com/models/2661/uber-realistic-porn-merge-urpm-legacy-version
https://civarchive.com/models/79570?modelVersionId=84383
https://civarchive.com/models/18637?modelVersionId=191384
https://civarchive.com/models/219439?modelVersionId=247432
https://civarchive.com/models/5245?modelVersionId=6087

Most of those are pretty horny checkpoints, so I'm gonna guess that NSFW stuff will come easily with this checkpoint, although I haven't checked that out yet.