Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello. I'm new to Nostalrius (about a week old), but not new to WoW. I have developed some tiny Addons previously and would like to bring them here.

Will only Ace and Ace2 mods/libraries work, or can we use Ace3 addons?

Thanks in advance...

I've only seen Ace and Ace2 AddOns so far on vanilla.

and from googling I believe Ace3 was build in 2.3.3 , which means most likely (at least parts of) the lib will not work here (or would've to be rewritten to work properly on here)