Graphical database client programs have been around for some time to support click-and-go interactions with a DBMS. They often support multiple database back-ends using a standard application programming interface (API), e.g. JDBC and ODBC. The MonetDB JDBC and ODBC drivers makes such tools work flawlessly with a MonetDB server and make your experience with MonetDB/SQL even better. Recommended Graphical User Interface (GUI) client programs are for example: Squirrel and DBvisualizer, but there are plenty more.
The foundation for building your own applications rest on the programming language bindings provided.