CodeHound SQL: SQL oriented search engine.
Editor Hub - SQL: List of editors with SQL support with reviews. Sorted by platforms and licenses.
JCC's SQL Standard Page: A source of information about SQL standards.
SQLinForm: A free web-based Java tool to format any SQL statement independent from their Database. It can also prepare SQL statements for Java, C#, VB, ASP.
The SQL Summit: Understanding SQL/XML and Information Retrieval: Portal site with information about databases, SQL/XML, XQuery, modeling, information retrieval, and web and grid data access. The site includes articles, papers, and audio and video programs.
UESQLC (Universal Embedded SQL Compiler): An embedded SQL-92 precompiler for C++ and Java, designed to be extensible using SGML documents. [Open source, GPL]