Create groups, clients, categories and add data to it.
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.
1Password - 1Password can create strong, unique passwords for you, remember them, and restore them, all directly in your web browser.
Fantasy Grounds - Fantasy Grounds is a virtual tabletop to help facilitate play of tabletop-style role-playing games...
KeePass - KeePass is an open source password manager. Passwords can be stored in highly-encrypted databases, which can be unlocked with one master password or key file.
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.