MySQL
http://www.mysql.com/
GNU SQL Server
http://www.ispras.ru/~gsql/
PostgreSQL
http://www.postgresql.org/
mSQL (Mini SQL)
http://www.hughes.com.au/
cdb
http://cr.yp.to/cdb.html
DiamondBase
http://www.csse.monash.edu.au/~darrenp/diamondbase.html
原作者：不详
来源：LinuxAid
