Open Source BSD VPN Software

VTun is the easiest way to create Virtual Tunnels over TCP/IP networks with traffic shaping, compression, and encryption. It supports IP, Ethernet, PPP and other tunnel types. VTun is easily and highly configurable. VPN, Mobile IP, Shaping, etc

The Proton VPN Browser Extension repository houses the code for an official browser extension that lets users quickly secure their web browsing traffic through ProtonVPN from within browsers like Firefox and Chrome without routing all system traffic. This extension provides users with a convenient way to encrypt and anonymize HTTP requests, hide IP addresses, and prevent tracking while browsing, acting independently of the full OS-level VPN clients. Because browser extensions are constrained by browser APIs, this extension focuses on securing in-browser connections, protecting privacy specifically within the browser context rather than across the entire operating system. Users can sign in with their Proton accounts, choose from available VPN locations, and connect or disconnect from the toolbar with a single click, making it practical for casual privacy protection or geo-unblocking content without installing native applications.

Poptop is an open source implementation of a PPTP server. Running under x86 or embedded Motorola ColdFire architectures Poptop provides full interoperability with the Microsoft PPTP VPN client.

An open-source free cross-platform multi-protocol VPN program, as an academic project from University of Tsukuba, under the Apache License 2.0. The API Suite allows you to easily develop your original SoftEther VPN Server management application to control the VPN Server (e.g. creating users, adding Virtual Hubs, disconnecting a specified VPN sessions) from JavaScript, TypeScript, C# or other languages. SoftEther VPN ("SoftEther" means "Software Ethernet") is one of the world's most powerful and easy-to-use multi-protocol VPN software. It runs on Windows, Linux, Mac, FreeBSD and Solaris. SoftEther VPN is an optimum alternative to OpenVPN and Microsoft's VPN servers. SoftEther VPN has a clone-function of OpenVPN Server. You can integrate from OpenVPN to SoftEther VPN smoothly. SoftEther VPN is faster than OpenVPN. SoftEther VPN also supports Microsoft SSTP VPN for Windows Vista / 7 / 8. No more need to pay expensive charges for Windows Server license for Remote-Access VPN function.

A client implementation of Secure Socket Tunneling Protocol (SSTP) for Linux / Mac OS-X that allows remote access via SSTP VPN to Microsoft Windows 2008 Server. This project has been moved to https://gitlab.com/eivnaes/sstp-client

DSVPN is a Dead Simple VPN, designed to address the most common use case for using a VPN. Runs on TCP. Works pretty much everywhere, including on public WiFi where only TCP/443 is open or reliable. Uses only modern cryptography, with formally verified implementations. Small and constant memory footprint. Doesn't perform any heap memory allocations. Small (~25 KB), with an equally small and readable code base. No external dependencies. Works out of the box. No lousy documentation to read. No configuration file. No post-configuration. Run a single-line command on the server, a similar one on the client and you're done. No firewall and routing rules to manually mess with. Doesn't leak between reconnects if the network doesn't change. Blocks IPv6 on the client to prevent IPv6 leaks. Works on Linux (kernel >= 3.17), macOS and OpenBSD, as well as DragonFly BSD, FreeBSD and NetBSD in client and point-to-point modes. Adding support for other operating systems is trivial.

Multi-Path Tunnel VPN is a peer-to-peer VPN tunnel that runs over UDP. It is designed for situations where a user has multiple network gateways or internet connections and wants to use several possible paths for one tunnel. The project can accept multiple local IP addresses and multiple remote IP addresses. This allows it to distribute tunneling across different routes instead of relying on only one connection. A common use case is connecting to a VPS through more than one internet link for better path flexibility. It is a low-level networking tool aimed at technical users who understand VPNs, UDP tunneling, and multi-path network setups.

WireGuard for Ubiquiti is a specialized integration of the WireGuard VPN protocol designed for Ubiquiti devices running the Vyatta-based EdgeOS or similar firmware. The project provides scripts and packaging that allow administrators to deploy WireGuard tunnels on supported Ubiquiti routers, extending modern VPN capabilities to network edge hardware. It focuses on enabling secure site-to-site and remote access connectivity within environments that rely on Ubiquiti’s networking ecosystem. Because many embedded router platforms have unique constraints, the repository includes device-specific configuration logic and automation tailored to these systems. The project helps bridge the gap between WireGuard’s core protocol and real-world network appliance deployments, especially in small business and prosumer infrastructure. Overall, wireguard-vyatta-ubnt is most valuable for network engineers and administrators managing Ubiquiti equipment who want fast, modern VPN functionality.

SSL-Explorer is a fully-featured, web-based SSL VPN server. This project is no longer actively maintained as the SSL-Explorer technology has now been acquired by Barracuda Networks, Inc.

OpenVPN ALS is a web-based SSL VPN server written in Java. It has a browser-based AJAX UI which allows easy access to intranet services. OpenVPN ALS is a direct descendant of Adito, which was a fork of SSL-Explorer.

Ncurses based tool for easily deploying IPsec tunnels using FreeSWAN (Linux only) Easy to configure a tunnel, simple options, user friendly interface

The SLAN project is a GPL open-source project providing a cross platform Virtual Private Networking (VPN) solution focused on providing secured and accountable links over insecure broadcast media such as 802.11 wireless LANs and public ethernets.

Hypersocket is a streamlined VPN solution built for all types of remote access scenarios. Powerful yet simple to use, Hypersocket uses a single installed client to provide access to any number of network resources. Its powerful granular access means you can have fine grained control over your entire network and remote users. Accessed through a secure HTTPS port, the Hypersocket client provides access to any number of host/port combinations all effortlessly assigned server-side by the Administrator through roles. The Administrator is able to configure the server through a web portal on the same HTTPS port. * Use as a typical VPN solution to replace IPSec type access for a more granular security policy * Use behind a fire-walled WLAN as a BYOD gateway * Use fine grained access to manage who has access to what resource * Keep your network and business safe by denying complete remote access to any user account * Support for Mac and Windows clients

OAST is a cross-platform front-end (GUI) for OpenVPN-client, allowing to manage multiple. It's quite simple in use and provides base functionality such as monitoring connection status. Application is written in Java so it works on both Windows and Linux

Campagnol is a decentralized VPN over UDP tunneling. It uses UDP hole punching to open connections through NAT/firewall and OpenSSL's DTLSv1 implementation for mutual authentication and encryption.

Gnome2 GUI for the Cisco vpnclient.

A Layer 2 Tunneling Protocol VPN client/daemon for Linux and other POSIX-based OSs.

SVPN provides an encrypted tunnel between two hosts, which in combination with IP forwarding enabled on one of the hosts can create a VPN.

sshvpn is a shell script based tool which uses openssh vpn tunneling feature to connect two private networks or attach a host to the remote private network securely over the internet.

Hamachi-gui is a graphical front-end to Hamachi, a populare zero-configuration VPN client. Its tires to mimic the official Hamachi Windows GUI.

CARMA VPN is a network management program written in PERL and CGI to assist in the implementation and management of a large fully meshed, fault tollerant, VPN network. The base network platform that CARMA VPN was developed for is Cisco IOS.

Compassh is an helper for the popular OpenSSH remote connection software, focused on providing near-VPN service without the complexity and the setup required by a real VPN. Using a VPN software may require an ad-hoc firewall setup, the generation of a key (pair) and the installation of the VPN software on a host that is not under your control. Compassh try to solve as much of this problems with a smart use of OpenSSH.

This contains a sample implementation of DTLS-VPN using OpenSSL DTLSv1 Support - to send data over an encrypted channel.

The GUI for Cisco VPN client is a graphic frontend programed in python for the Cisco VPN client for Linux

This project focuses on bringing commercial quality L2TP support to Linux and possibly other Unixes. L2TP stands for Layer 2 Tunneling Protocol. It is a VPN similar to PPTP and a number of others. L2TP often competes with PPPoE.