I have just released some tools which are either free or have free editions - there is:

SQL Everywhere - an IDE with code completion, auditing, multiple execution, lots more - free edition available

http://www.atlantis-interactive.co.uk/products/sqleverywhere/

Schema Inspector - a schema comparison and synchronisation tool - free edition available

http://www.atlantis-interactive.co.uk/products/schemainspector/

Data Space Analyser - a graphing tool to explore the space used in databases - totally free

http://www.atlantis-interactive.co.uk/products/dataspaceanalyser/