Pathfinder Nexus is a set of online tools for running and playing the Pathfinder tabletop role-playing game, similar to D&D Beyond. The system, developed by Demiplane, has now entered an open, public beta. The beta system includes Character Builder and Character Sheet tools.
Also similar to D&D Beyond, Nexus will includes rules information and guidance within the character builder and sheet, including a “click-to-know” system, which pops up rules and info for just about anything listed on the character sheet, when clicked.
You can sign up for the open beta here.