StrongSwan is a powerful, open source, IPsec-based VPN solution that provides a secure connection between two networks. It supports both site-to-site and remote-access VPN connections and uses the latest IKEv2 and IPsec protocols for data encryption and authentication. StrongSwan also includes a wide range of features, such as tunneling, NAT traversal, traffic shaping, IPsec policies, and support for various authentication methods. It is easy to set up, configure, and manage, making it a great choice for large or small organizations. StrongSwan can also be used for remote access, allowing users to securely connect to their organization's corporate network from any location.
Discontinued The program appears to no longer be updated. The latest version, 1.0b, released in April 2015, can be downloaded from this archived version of the now closed website: https://archive.is/pdGHX