Generally speaking, all the MonetDB programs are started from a command shell (such as bash or cmd.exe) or invoked from a script file. They do not have a Graphical User Interface (GUI)
However, as a user you may prefer to use more friendly GUI-programs. Many good GUI-programs are available. Those generic GUI-programs typically allow you to connect to any DBMS via standard database connectivity API such as ODBC or JDBC. MonetDB provides both an ODBC driver and a JDBC driver. The JDBC driver is usable for programs written in Java. There are also MonetDB server connectivity API libraries available for popular programming languages such as Python, PHP, Perl. [More].
If you need the MonetDB ODBC driver or JDBC driver, you will need to download, install and configure them at the computer OS where the GUI-program is installed or started. For the ODBC driver you will need system administrator privileges to install the MonetDB ODBC driver components. For the JDBC driver no sys-admin privileges are needed, you only have to download the single jar (Java ARchive) library file (i.e. monetdb-jdbc-2.29.jre7.jar) from the download area and configure in your GUI-program where the jar file is stored (or add it to the CLASSPATH environment setting or java -cp startup parameter). The MonetDB JDBC driver is a 100% pure Java (type 4) driver, which means the same JDBC driver can be deployed on all platforms which support the Java Runtime Environment (JRE) version 1.7 or higher.