MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
TiddlyWiki - a non-linear personal web notebook
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Confluence - Confluence is content collaboration software that changes how modern teams work
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.