Pritunl is a free, secure, and open-source cross-platform OpenVPN client. Additional integration available when connecting to a Pritunl server.

Features:

• Open Source - All source code for Pritunl is publicly available on GitHub. To allow anyone to evaluate Pritunl to ensure that it is secure.
• Free to Use - Free and open source alternative to Viscosity. No registration or credit card necessary.
• Easy Configuration - Easily add OpenVPN profiles by importing the configuration or by using the URI available with Pritunl servers.