OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. With OpenVPN, you can tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port, use real-time adaptive link compression and traffic-shaping to manage link bandwidth utilization and lot more.

OpenVPN - open source SSL VPN solution 

SoftEther VPN is a ?Cross-platform Multi-protocol VPN Program. It supports SSL-VPN protocol to penetrate any kinds of firewalls. Ultra-optimized SSL-VPN Protocol of SoftEther VPN has very fast throughput, low latency and firewall resistance. Virtualization of Ethernet devices is the key of the SoftEther VPN architecture. It virtualizes Ethernet devices in order to realize a flexible virtual private network for both remote-access VPN and site-to-site VPN.
 
Its feature include: 
<UL>
<LI>Easy to establish both remote-access and site-to-site VPN.</LI>
<LI>SSL-VPN Tunneling on HTTPS to pass through NATs and firewalls.</LI>
<LI>Revolutionary VPN over ICMP and VPN over DNS features.</LI>
<LI>Ethernet-bridging (L2) and IP-routing (L3) over VPN.</LI>
<LI>Embedded dynamic-DNS and NAT-traversal so that no static nor fixed IP address is required.</LI>
<LI>AES 256-bit and RSA 4096-bit encryptions.</LI>
<LI>The OpenVPN clone function supports legacy OpenVPN clients.</LI>
<LI>RADIUS / NT Domain user authentication function.</LI>
<LI>Deep-inspect packet logging function.</LI>
</UL>

 SoftEther VPN is a ?Cross-platform Multi-protocol VPN Program. It supports SSL-VPN protocol to penetrate any kinds of firewalls. Ultra-optimized SSL-VPN Protocol of SoftEther VPN has very fast throughput, low latency and firewall resistance. Virtualization of Ethernet devices is the key of the SoftEther VPN architecture. It virtualizes Ethernet devices in order to realize a flexible virtual private network for both remote-access VPN and site-to-site VPN.

SoftEther VPN - Cross-platform Multi-protocol VPN Program

Wiretrustee is an open-source VPN platform built on top of WireGuard® making it easy to create secure private networks for your organization or home. It requires zero configuration effort leaving behind the hassle of opening ports, complex firewall rules, VPN gateways, and so forth.
 
Wiretrustee features a Management Service that offers peer IP management and network updates distribution. It uses WebRTC ICE implemented in pion/ice library to discover connection candidates when establishing a peer-to-peer connection between devices.
 
Its features include:
<ul>
<li>Centralized Peer IP management with a UI dashboard.</li>
<li>Encrypted peer-to-peer connections without a centralized VPN gateway.</li>
<li>Automatic Peer discovery and configuration.</li>
<li>UDP hole punching to establish peer-to-peer connections behind NAT, firewall, and without a public static IP.</li>
<li>Connection relay fallback in case a peer-to-peer connection is not possible.</li>
</ul>

Wiretrustee is an open-source VPN platform built on top of WireGuard making it easy to create secure private networks for your organization or home. It requires zero configuration effort leaving behind the hassle of opening ports, complex firewall rules, VPN gateways, and so forth.

Wiretrustee - Connect your devices into a single secure private WireGuard®-based mesh network

WireGuard is an extremely simple yet fast and modern VPN that utilizes state-of-the-art cryptography. It aims to be faster, simpler, leaner, and more useful than IPSec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances.
 
 WireGuard uses state-of-the-art cryptography, like the Noise protocol framework, Curve25519, ChaCha20, Poly1305, BLAKE2, SipHash24, HKDF, and secure trusted constructions. It makes conservative and reasonable choices and has been reviewed by cryptographers.

WireGuard is an extremely simple yet fast and modern VPN that utilizes state-of-the-art cryptography. It aims to be faster, simpler, leaner, and more useful than IPSec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances.

Wireguard - Fast, Modern, Secure, VPN Tunnel

tinc is a Virtual Private Network (VPN) daemon that uses tunnelling and encryption to create a secure private network between hosts on the Internet. All traffic is optionally compressed using zlib or LZO, and LibreSSL or OpenSSL is used to encrypt the traffic and protect it from alteration with message authentication codes and sequence numbers.
 
VPN traffic is always (if possible) sent directly to the destination, without going through intermediate hops. As long as one node in the VPN allows incoming connections on a public IP address (even if it is a dynamic IP address), tinc will be able to do NAT traversal, allowing direct communication between peers.

tinc is a Virtual Private Network (VPN) daemon that uses tunnelling and encryption to create a secure private network between hosts on the Internet. All traffic is optionally compressed using zlib or LZO, and LibreSSL or OpenSSL is used to encrypt the traffic and protect it from alteration with message authentication codes and sequence numbers.

Tinc - a VPN daemon

1-click deployment of OpenVPN with DNS ad blocking sinkhole. Deploys to your favorite VPS machine. Created with Vue.js, Semantic UI and Django. This app provides easy management console to keep OpenVPN configuration files in one place, provided in self-contained, easily deployable, clickable package.


vpn-at-home - 1-click, self-hosted OpenVPN deployment and management app.

strongSwan is an OpenSource IPsec implementation. IPSec is an encryption and authentication standard that can be used to build secure Virtual Private Networks (VPNs). It has powerful IPsec policies supporting large and complex VPN networks. It implements both the IKEv1 and IKEv2 (RFC 7296) key exchange protocols. 

strongSwan - IPsec-based VPN Solution

SocialVPN is an open-source IPOP-based virtual network that connects your computers privately to your friends’ computers. It automatically maps online social network relationships using Jingle and XMPP to create your own user-defined peer-to-peer VPNs – with no hassle, and supporting unmodified TCP/IP applications. 
 
In the SocialVPN, each user is in control of who their VPN connects to. To scale to large online social networks, SocialVPN employs a unique dynamic IPv4 address allocation/translation approach that avoids conflicts with local networks and devices outside a user’s social network. creates a communication overlay that can be used as a basis to design decentralized Online Social Networks (OSNs). It keeps the data sharing private.

SocialVPN is an open-source IPOP-based virtual network that connects your computers privately to your friends’ computers. It automatically maps online social network relationships using Jingle and  XMPP  to create your own user-defined peer-to-peer VPNs – with no hassle, and supporting unmodified TCP/IP applications. 

SocialVPN - P2P VPN that connects you to your friends computer

Openswan is an IPsec implementation for Linux. It has support for most of the extensions (RFC + IETF drafts) related to IPsec, including IKEv2, X.509 Digital Certificates, NAT Traversal, and many others. It has been the de-facto Virtual Private Network software for the Linux community since 2005. If you are running Fedora, Red Hat, Ubuntu, Debian (Wheezy), Gentoo, or many others, it is already included in your distribution.

Openswan - IPsec implementation for Linux

Pritunl is built with OpenVPN and any existing OpenVPN client can be used. IPsec is used for site-to-site links and VPC peering. All traffic between clients and the server is encrypted. Optional two-step authentication is available using Google Authenticator. It can be easily distributed across multiple servers and different datacenters for improved performance, high availability and automatic failover when an instance fails.

Pritunl - Enterprise Distributed OpenVPN and IPsec Server

PeerVPN is a software that builds virtual ethernet networks between multiple computers. Such a virtual network can be useful to facilitate direct communication that applications like file sharing or gaming may need. Often, such direct communication is made impossible or very difficult by firewalls or NAT devices.
 
Most traditional VPN solutions follow the client-server principle, which means that all participating nodes connect to a central server. This creates a star topology, which has some disadvantages. The central node needs lots of bandwith, because it needs to handle all the VPN traffic. Also, if the central node goes down, the whole VPN is down too. A virtual network built by PeerVPN uses a full mesh topology. All nodes talk directly to each other, there is no need for a central server. If one node goes down, the rest of the network is unaffected.

PeerVPN is a software that builds virtual ethernet networks between multiple computers. Such a virtual network can be useful to facilitate direct communication that applications like file sharing or gaming may need. Often, such direct communication is made impossible or very difficult by firewalls or NAT devices.

PeerVPN - the open source peer-to-peer VPN

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