The standard OpenVPN client for Windows, OpenVPN GUI, provides a system tray icon and minimal user interface for making VPN connections. Please see the OpenVPN client setup guide for Windows to get started.
Alternatively, a proprietary client with a more friendly user interface called the OpenVPN Desktop Client is available for Windows. This client can be downloaded from here and HowTo guides are provided here.
Mac OS X
Tunnelblick is an OpenVPN client for macOS (OS X). To install Tunnelblick, download the dmg from the Tunnelblick site, mount the dmg, and drag the Tunnelblick application to Applications. Please take a look at the Tunnelblick setup guide for details.
OpenVPN is available through the standard package management system on most Linux distributions.
sudo apt-get install openvpn
sudo yum install openvpn
Then, to run OpenVPN:
sudo openvpn --config profile.ovpn
profile.ovpn is the configuration profile downloaded from csconnect.hofstra.edu.