JCC's SQL Standard Page  
   A source of information about SQL standards.
   http://www.jcc.com/SQLPages/jccs_sql.htm

UESQLC (Universal Embedded SQL Compiler)  
   An embedded SQL-92 precompiler for C++ and Java, designed to be extensible using SGML documents. [Open source, GPL]
   http://www.uesqlc.org/

CodeHound SQL  
   SQL oriented search engine.
   http://www.codehound.com/SQL/

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.
   http://www.sqlsummit.com/

Apex SQL Edit  
   A IDE especially designed for SQL Server developers including integration with source safe, intellisense, SQL formatting, data editing and advanced features like procedure/column intellisense, collapsing regions, deployment projects.
   http://www.apexsql.com/sql_tools_edit.htm