There's a handful of RWBY AUs on youtube specifically -- probably the most popular (if the most controversial in this effing fandom) is Fixing RWBY by Celtic Phoenix. As a fan myself, I highly suggest it, it got me to cry for Vernal of all characters. It's not fully animated, more like a slideshow with script-like narration, but each volume of work has slowly had more and more artists on the project to the point that the latest one (Volume 7) is like 90% original art (which includes occasional animations) and original music.

Another fairly prominent one is RWBY: Reversed Fates by Judgemental Critter. It's presented in much the same way as FRWBY -- narration over paper dolls using all of Critter's own art. I remember liking the first season well enough but I'm behind and haven't seen her second season yet.

RWBY: Evermorrow is another well-known one; it started as kind-of an audio drama with a slideshow of pictures but by now it's nearly fully animated, if a little rough around the edges.

RWBY: Dust Queen was a highly-anticipated fully-animated project to bring a fanfic of the same name to life, but recently ran into some drama issues and if we ever see it again, it won't be for a long time. (◡︵◡) Episode 1 still got made and looks gorgeous, but also sadly the project lead (the original author) took down the fanfic so you have to search for backup copies if you wanted to read what was upcoming.

There were two "RWBY OVAs" by Cake Station which were kinda fun and look exactly like Poser-era RWBY, but they were from years ago and I don't think any more are currently being worked on.

As far as Remnant's Reclaimer goes, it's a bit of a relic from early in the fandom (seems to have been written just after V1), and it was never finished, but everyone who reads it absolutely loves what there was. I'm actually kinda quoting someone else when I mention "THE SACRED TEXTS!" meme, as that was their reaction when I brought up the name in conversation.