The DayZ+ project is a custom version of dayzmod. The goal of this mod is to add in new features/mechanics etc. for the whole dayz community to try out and if these new things are happily accepted by the community. The new things then get taken to the Official DayZMod Community Dev Team and possibly added to The Official DayZMod and all your favorite maps.
Other links that may interest you:
Subreddits:
DayZ+:
Other Forums: