Recently I switched to notebook.ai. It has customizable entries for characters, locations, items etc. It may be searched or filtered by name, by tag and with a full-text search. It also allows interlinking the entries for easier reference and navigation. - Source: Reddit / 29 days ago
Https://worldanvil.com is another tool that can be useful. I find it a little daunting however. - Source: Reddit / about 1 month ago
I'm currently using Roll20.com as a virtual table top (VTT) for my Pathfinder RPG and mostly like it, but since I know not to get too invested in any one tool, so I like to investigate other options. I'm using WorldAnvil as my knowledge repository for my campaign and the developers notes show it integrates with Foundry VTT. Yay, bonus! - Source: Reddit / 25 days ago
Kanka.io - Kanka.
Plot Factory - Online story planner, organizer, and writing application.
Notebook for Web - The beautifully simple note-taking app. Now on the Web.
Persona by Mariner Software - Persona is a character creation and organization app for writers.
The Everlast Notebook - Smart paper-and-pen notebook
World Scribe - World Scribe is a platform that eases the creation process if novel and allows users to keep track of important elements in their world.