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

Zentyal is a Linux Small Business Server, good alternative Windows Business Server. Zentyal can act as a Gateway, Infrastructure Manager, Unified Threat Manager, Office Server, Unified Communication Server or a combination of them. It is built on Ubuntu Linux distribution. This package includes LDAP server, Mail server, Firewall, Network infrastructure, VPN support, Web server, File server, Print server, FTP server, Groupware, VoIP server, Virtual Machines management and lot more.

Zentyal - Linux Small Business Server

IPFire is a server distribution with intended to use as a firewall. It focuses on flexibility, and scales from small to middle sized business networks and home networks. Beginning with a small firewall system of a few megabytes, it is possible to run IPFire as a file server or VPN gateway for staff, branches or customers. This modularity means that yor version of IPFire runs with exactly what you require and nothing more.

IPFire - An open source firewall solution

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

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

VyOS is an open source network operating system that can be installed on physical hardware or a virtual machine on your own server, or a cloud platform . It is based on GNU/Linux and joins multiple applications such as Quagga, ISC DHCPD, OpenVPN, StrongS/WAN and others under a single management interface.
 
VyOS is more similar to traditional hardware routers, with a focus on comprehensive support for advanced routing features such as dynamic routing protocols and command line interface. It has long list of features like VPN, Firewalls, VLAN, Static and Dynamic routing, Flow accounting and alot more.

VyOS is an open source network operating system that can be installed on physical hardware or a virtual machine on your own server, or a cloud platform . It is based on GNU/Linux and joins multiple applications such as Quagga, ISC DHCPD, OpenVPN, StrongS/WAN and others under a single management interface.

VyOS - Network Operating System 

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OpenVPN - open source SSL VPN solution

SoftEther VPN - Cross-platform Multi-protocol VPN Program

Zentyal - Linux Small Business Server

IPFire - An open source firewall solution

strongSwan - IPsec-based VPN Solution

Openswan - IPsec implementation for Linux

VyOS - Network Operating System

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OpenVPN - open source SSL VPN solution

SoftEther VPN - Cross-platform Multi-protocol VPN Program

Zentyal - Linux Small Business Server

IPFire - An open source firewall solution

strongSwan - IPsec-based VPN Solution

Openswan - IPsec implementation for Linux

VyOS - Network Operating System

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