Xmind - Xmind is a brainstorming and mind mapping application.
MySQL - The world's most popular open source database
Visual Understanding Environment - Visual Understanding Environment (VUE) is a mind-mapping and concept-mapping tool.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
SQLite - SQLite Home Page