SLAM tracking on Unity

I’m doing an AR application for my university project and I have to use SLAM tracking so I’m searching for 3 or 4 SLAM porting for unity to compare them but I can’t find anything Googling. Can you please give me a list or just the bests 4-5 porting so that i can search and compare?

The software that allows you to test their SLAM technology for free (at least from what I’ve tested/know): Kudan, VOID AR and maybe EasyAR. All of those have support for Unity.
Good luck!