Series:

Breachtale by Elrick Animation

(An animated series where the creator made his own story of the UT Multiverse. He’s still working on it and it soo good )

Glitchtale by Camila Cuevas

(An animated series with a great story and great animation. This is an AU. Some people don’t like it, maybe because of the animation style, the beggining, or just the story) (The playlist isn't Calisa's, but it is better than hers)

Underverse by Jael Peñaloza

(We all know this one. It’s incredible, one of the best I’ve seen... just wow!)

Dark Spirit by Peng2_comics

(Another AU. The creator just started this animated series, but it’s already great. The videos are short, but they post new ones often... and it is a little uh.. 'sus')

Othertale by Super Youmna

(Another amazing AU, but the creator stopped working on it a long time ago)

Dimensionverse by August Minner

(This isn’t an animated series. It’s just an interesting UT Multiverse by August, who also makes animation memes about it and I love the art style!)

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Comics:

Dead Ringer by hxllo nana

(My favorite comic, available on yt. It’s about Murder Sans getting stuck in another AU by accident)

Epictale by yugogeer012

(My second favorite comic. It’s another AU, it is pretty funny, and you can find it on Tumblr. Amazing art style)

Horrortale by Sour-Apple-Studios

(My third favorite comic, also an AU. It’s a horror AU, and you can find it on DeviantArt) (I recommend you to read it from the link I gave you, it is much easier bcs the comic is very disordined)

Something New by rahafwabas

(This is only the first part, but I thought it was really good. It looks like the creator didn’t continue it, tho..)

Undertale Over The Void by Over The Void Blog

(An interesting comic set in an AT where Frisk, Asriel, and MK are on the surface and get teleported to another world ir maybe it is an... AU??)

TWIN RUNES by Akenemnon

(This comic connects Undertale with Deltarune, and it is funny.*no more spoilers!*)

Seventh Soul by EightTheKat

(I enjoyed this comic, the creator is still making new parts. Once again, an AU) (I recommend watching it from the link I gave you not from their DeviantArt account, it is very disordined. Or just from the yt where it has voice acting, channel: Sans Comic TV. Here's the playlist.)

A L I V E by tatatale

(I really liked this one! It’s finished, and I’d definitely recommend reading it. I love the art style)

Handplates by Zarla

(A fantastic comic and one of my favorites. You can find it on yt with voice acting included from the link, the channel: Calysto)

A Thorn In My Side by theFluffySlipper

(Another AU what I liked, and I am not sure but I think the creator is still working on it)

Untitled Soul by s3izures(their DeviantArt username, but they don't use that app anymore)/s3-izures(tumblr)

(Another AU or more like an AT because it is Undertale but someone gets there by accident) (You can watch it again on yt with voice acting by Sans Comic TV, playlist.)