http://www.mysql.com/ The MySQL database home page, with news, downloads, and documentation.
http://dev.mysql.com/doc/ MySQL database home page's documentation repository. If you want to learn more about MySQL, visit the documentation center.
http://www.postgresql.org/ PostgreSQL database home pages. PostgreSQL is one of the world's most advanced open-source databases supporting almost all SQL constructs, including subselects, transactions, user-defined types, and so on.
http://www.postgresql.org/docs/ PostgreSQL database home page's documentation repository. You can start here to find a wealth of PostgreSQL information available online. This section of the website contains current and archived manuals for PostgreSQL users and administrators.
http://www.knoda.org/ The home page to download the newest Knoda client or learn more about it.
