1. Active query builder: www.activequerybuilder.com. Active query builder: www.activequerybuilder.com.
2. Flyspeed sql query: www.activedbsoft.com. Flyspeed sql query: www.activedbsoft.com.
3. Sqleo visual query builder: sqleo.sourceforge.net. Sqleo visual query builder: sqleo.sourceforge.net.
4. CourseRank