Java
.NET
Software development
Web development
XML
Free DBMSs
IBM DB2 Express-C
SQL Server 2005 Express Edition
MySQL
Oracle 10g Express Edition (XE)
Free database tools
SQuirreL (JDBC based)
SQLyog - MySQL
Oracle
Oracle Application Express (HTML DB)
Oracle SQL Developer
Toad for Oracle
Java driver
docs 4.1, 5.0, 5.1
Microsoft SQL Server
Management Studio Express
Microsoft SQL Server Database Publishing Wizard 1.1 - included in VisualStudio 2008 - tutorial
Microsoft T-SQL
MSDN - TSQL reference
DevGuru TSQL charts
DevGuru TSQL quick reference