MySQL is open source and free. The enterprise version is how open source companies make their money.
Driftweed, Why not just use LibreOffice's Base program http://www.libreoffice.org/discover/base/ not only will if create a db it will also interface as a frontend with MySql and it forks. It will also access the rest of the LO suite.
I have never used base but LO suite is my goto for office programs.