One of the great open source database servers is for sure Firebird Server. Firebird is open source multiplatform SQL relation database server, which runs on Windows, Linux and Mac as well.
If you need to download Firebird Server, check out this page: http://www.firebirdsql.org/en/firebird-2-5-1/
Video guide is accessible also on Vimeo: http://vimeo.com/32568934
Your Veratec team