DB Forums
dBforums is a discussion forum and helpdesk for database design, development and administration issues.
http://www.dbforums.com/

Toad Soft
Toad is a powerful, low-overhead tool that makes database and application development faster and easier and simplifies day-to-day administration tasks.
http://www.toadsoft.com/

Developer
You are probably still pumping data in and out of a database, just as we all did a
decade or more ago. That makes it all the more surprising that mistakes are still being made that date back to the good old days of Windows 95 and before.
http://www.developer.com/db/article.php/3589351

Choosing a free database
We all like to get stuff for free. Not paying for something leaves money to spend on something else. So, when you come across something that is free it is hard to say "no"; the non-free alternative has to have a lot of value to win over "free". But what if you have a choice of "free"?
http://it.toolbox.com/blogs/database-talk/choosing-a-free-database-15971

Oracle
Oracle Database 10g Express Edition (Oracle Database XE) is an entry-level, small-footprint database based on the Oracle Database 10g Release 2 code base that's free to develop, deploy, and distribute; fast to download; and simple to administer.
http://www.oracle.com/technology/products/database/xe/index.html

Database Answers
We provide a Library of free Data Models and Database designs.
http://www.databaseanswers.org/data_models/

PHP My Admin
phpMyAdmin is a free software tool written in PHP intended to handle the administration of MySQL over the World Wide Web. phpMyAdmin supports a wide range of operations with MySQL. The most frequently used operations are supported by the user interface (managing databases, tables, fields, relations, indexes, users, permissions, etc), while you still have the ability to directly execute any SQL statement.
http://www.phpmyadmin.net/home_page/index.php

MySql
MySQL is the world's most popular open source database software, with over 100 million copies of its software downloaded or distributed throughout its history. With its superior speed, reliability, and ease of use, MySQL has become the preferred choice for Web, Web 2.0, SaaS, ISV, Telecom companies and forward-thinking corporate IT Managers because it eliminates the major problems associated with downtime, maintenance and administration for modern, online applications.
http://dev.mysql.com/

MySql Tips
Snippets of MySQL tips, solutions, examples, tutorials, and even benchmarks.
http://mysql-tips.blogspot.com/

Wamp Server
Apache, PHP, MySQL on Windows
http://www.wampserver.com/en/

Postgre SQL
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. It is fully ACID compliant, has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages). It includes most SQL92 and SQL99 data types, including INTEGER, NUMERIC, BOOLEAN, CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP. It also supports storage of binary large objects, including pictures, sounds, or video. It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others, and exceptional documentation.
http://www.postgresql.org/