D20.world is a website where you can organize your campaign for any table-top RPG-games (ttRPG). As a GM you can create your world, populate it with your NPCs along the way, and let your players save their notes on each NPC and session, if they wish to.
The website works best in desktop mode, but we're working a mobile-version too.
If you want to try out the site before signing up, you can access the demo-version here. Play around as you want here.
D20.world has just been launched as a beta version, so if you have any suggestions for new features, we're all ears!