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OpenVPN

ProtonVPN is a virtual private network service provider operated by the Swiss company Proton Technologies AG, the provider of ProtonMail. Just like ProtonMail, ProtonVPN is a community supported project that aims to build a safer Internet that also protects civil liberties. The service provides a strict no data logging policy, that ensures that no personal data is kept by ProtonVPN. It also has Tor integration and SecureCore servers for additional security if needed. Currently, ProtonVPN provides over 560 servers in more than 40 countries.

With ExpressVPN you can overcome content restrictions and censorship so that you can access video, music, social media, and more, from anywhere in the world. ExpressVPN hides your IP address and encrypts your network data so no one can see what you're doing online. In 2020, both TechRadar and CNET named the service their Editors' Choice

PureVPN is a UK-based VPN service that features kill switch and split tunneling. In total, PureVPN has more than 6,500 encrypted VPN servers and 300,000 anonymous IPs across the globe. The service allow you to choose from 4 different types of activities (Stream, Internet Freedom, Security/Privacy, and File Sharing) and tailor your current connection accordingly.

OpenConnect is an open-source SSL VPN client for Linux and Windows. OpenConnect is based upon SSL security protocol and was built as a replacement VPN client for Cisco’s AnyConnect SSL VPN. With support from the open source community it has now become the standard underlying technology for many VPN providers. With OpenConnect you can implement your own server, initiate data encryption, and import and manage server configurations.

Openswan has been a popular VPN alternative for Linux users since2005. It is an IPsec implementation with support for most of its extensions (RFC and IETF drafts), even IKEv2, NAT Traversal, X.509 Digital Certificates and more. Openswan comes packages with various Linux distributions, including Gentoo, Fedora, Ubuntu, Red Hat and others.

SocialVPN or IPOP (IP-Over-P2P) is a user-centric, open-source software virtual network that lets end users build their own VPNs. SocialVPN is capable of establish peer-to-peer (P2P) virtual private networks with the help of a social backend like XMPP server (Jabber-Net or Google chat). Such reliable backend can securely authenticate users, maintain a list of each party and establish secure TLS for X.509 certificate exchange.