http://www.datadirect.com/products/jdbc/database
The Progress DataDirect Database.com JDBC driver enables access to business-critical cloud data via SQL and JDBC to Database.com. The Connect XE for JDBC Driver combines read/write access to Database.com objects, custom objects, and reports with realtime data caching and Type 5 JDBC driver features.
Progress DataDirect (http://www.datadirect.com/)