Download X2Go Client for Windows, Mac, or Linux.

Session name: niasra-node1
Host: niasra-node1
Login: your username
Tick: Use Proxy server for SSH connection
Tick: Same login as on X2Go Server
Tick: Same password as on X2Go Server
Host: hpc.niasra.uow.edu.au
Session type: XFCE

Untick: Enable sound support
Untick: Client side printing support

Click the niasra-node1 profile to connect.

On your first login, click 'Use default config'.

RStudio and MATLAB can be found under the 'Applications' menu in the 'Development' submenu.