Putty is a best known tool for accessing servers that provide SSH and Telnet connections.
The advantages of Putty are: easy to manage and be lightweight software. You can download the putty here: http://www.putty.org/
Remember: to access the HPC outside of the University network use the VPN. How to get access via VPN: https://www.aber.ac.uk/en/is/it-services/vpn/