Apparently its run by some people who were involved in WNO before it closed. I believe that it's mostly comprised of the staff who were not happy with the direction that WNO took. I don't want to go hogpit here, but they seem like a good bunch.
Directly from the helpfiles :
--[Help canon]-----------------------------------------------[Phoenix Rising]--
What do we consider canon here at Phoenix Rising? Good question, and it has a
relatively simple answer.
All of the TV shows, with the exception of Star Trek: Discovery. We're on the
fence about the Mycelium Spore Drive, and some of the tech they've introduced
so far was introduced as new in some of the TV shows that came before it, yet
are after it in the timeline. That makes it a little hard to reconcile.
Also, the two J.J. Abrams Star Trek movies, and the third that followed, Star
Trek Beyond co-written by Doug Jung and Simon Pegg are not considered canon
here on Phoenix Rising. All good movies, but they are in an alternate
timeline from the movies and TV shows that came before them.
Primary sources for canon information that have been used in developing
Phoenix Rising are:
Memory Alpha (http://memory-alpha.wikia.com/wiki/)
Star Trek Star Charts - The Complete Atlas of Star Trek
written and illustrated by Geoffrey Mandel
Star Trek Deep Space Nine Technial Manual - Pocket Books
by Herman Zimmerman, Rick Sternbach, and Doug Drexler
Star Trek The Next Generation Technical Manual - Pocket Books
by Rick Sternach and Michael Okuda
As for the system, not sure. Sorry.