Xmind - Xmind is a brainstorming and mind mapping application.
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.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC