Softwares for database

1.Oracle
http://www.oracle.com/technology/software/index.html
http://oss.oracle.com/
2.IBM DB2 Express-C
http://www-306.ibm.com/software/data/db2/express/
3.Mysql database
http://dev.mysql.com/downloads/
4.Apache Derby(Cloudscape)
http://www.ibm.com/developerworks/db2/zones/cloudscape/
5.Maxdb(SAPDB)
http://www.sapdb.org/7.4/sap_db_software.htm
6.Microsoft SQL Server
http://msdn2.microsoft.com/en-us/express/bb410792.aspx
7.Sybase
http://www.filebuzz.com/files/Sybase_Free_Log/1.html
8.Visual Fox Pro
http://www.brothersoft.com/downloads/visual-foxpro-9.0.html