I use Eclipse's Database development plugins - like all Java based SQL editors, it works cross platform with any type 4 (ie pure Java) JDBC driver. It's ok for basic stuff (the main failing is it struggles to give transaction control -- auto-commit=true is always set it seems).
Microsoft have a decent JDBC type 4 driver: http://www.microsoft.com/downloads/details.aspx?FamilyId=6D483869-816A-44CB-9787-A866235EFC7C&displaylang=en this can be used with all Java clients / programs on Win/Mac/Lin/etc.
Those people struggling with Java/JDBC on a Mac are presumably trying to use native drivers instead of JDBC ones -- I haven't used (or practically heard of) the ODBC driver bridge in almost 10 years.