Open Source C# VPN Software

The ProtonVPN Windows app project hosts the official open-source client software that lets users securely connect their Windows machines to the ProtonVPN service with full system-wide VPN protection. It includes a modern GUI built with .NET and WPF that lets users authenticate, choose VPN servers, and configure features like split tunneling or kill switch, while a background Windows service manages VPN connections using the OpenVPN protocol and handles networking tasks such as firewall and adapter configuration. The app integrates a custom TAP driver and a split tunnel callout driver to help route traffic securely and prevent leaks, and is structured so the GUI and service components work together to deliver a smooth user experience on Windows desktops and laptops. ProtonVPN’s Windows client supports both free and paid users with access to Proton’s global server network, encrypted tunnels, and privacy-first policies that block logging and respect user anonymity.

V2ray Config Pool - Multi-Protocol Free VPN Configuration Manager Configs are updated every hour from various sources Description: V2ray Config Pool is a free Windows application designed for users who need seamless access to global VPN configurations. This powerful tool collects and organizes a wide range of protocols, including VMess, VLESS, Trojan, HTTPS, Shadowsocks, and WireGuard, from over 60 countries based on IPs and locations. Whether you are a VPN enthusiast or a professional looking to optimize your network, V2ray Config Pool makes it easy to find and use configurations tailored to your needs. Key features include: * Global Database: Access a rich pool of configurations and subscriptions from 60+ countries. * Wide Protocol Support: Manage VMess, VLESS, Trojan, Shadowsocks, WireGuard, and more in one place. * Optimized for Performance: Ensure secure, fast, and reliable connections. Empower your networking experience with V2ray Config Pool—a comprehe

TunMod VPN Client is a Windows App designed for secure VPN tunneling and seamless server connections. Featuring Payload Generator, SSH Client, SSL/TLS Tunneling, and multi-profile management, it allows for customized, encrypted connections. TunMod also supports V2Ray, Xray, and XTLS protocols,l2tp,PPTP,HTTPS,OpenVPN, making it a comprehensive solution for advanced tunneling needs. Any suggestions or bug reports: tunmodsupp@gmail.com https://github.com/TunMod/TunMod-VPN-Client

Source: https://github.com/AlizerUncaged/HTTP-Injector respite is a SSH/openVPN client that allows you to connect to the internet with custom injected HTTP Proxy headers. This application requires Java (https://www.java.com/en/download/) and .Net 4.5 (https://www.microsoft.com/en-ph/download/details.aspx?id=42642 .Net 4.5 is already preinstalled in Windows 10). There are many SSH and OpenVPN Server providers in the internet, one is https://www.tcpvpn.com HTTP Proxy responses override (source code): https://github.com/AlizerDoesJava/respite-proxy-override Please rate, any feedback is appreciated. The application and server providers are free.

AutoVPNConnect is a nice tool for everyone that works daily with VPN. This tool keeps your VPN connection open. Every VPN connection created with the Windows built in VPN client is supported. This tool can connect to your VPN when starting Windows, and can be configured to work completely in background. Install it and enjoy! Supported Windows versions: Windows 7 Windows 8 Important note: AutoVPNConnect is since version 3.0 significantly improved. When you are running an older version, you should consider to upgrade to the latest version. See the page 'Files' for more information.

** IMPORTANT NOTICE: This is a software component for OpenVPN Client service. Therefore, OpenVPN Client service has to be installed and configured first. Then, this software will help you connect automatically OpenVPN service for you. As well as, You will not need to enter username and password not even once. This software will do it for you. (Yet, this software only support VPNBook service.) OpenVPN website : https://openvpn.net VPNBook website : https://www.vpnbook.com To use this software... * You must have installed OpenVPN Client service. * Microsoft .Net Framework 4.5 should have been installed. * This program should keep in the OpenVPN installed directory. (Usually C:\Program Files\ OpenVPN) To download OpenVPN Client software, Please visit this website. https://openvpn.net/index.php/open-source/downloads.html How to set up OpenVPN Service (Step-by-step Guide) https://www.vpnbook.com/howto/

Coyote Linux is a security-centric distribution of Linux designed to provide firewall, VPN, IP routing, and various other functions.

AdbTether lets your Windows PC use your Android phone's internet — including the VPN on the phone. No root, hotspot, or VPN client on the PC. Connect your phone, enable debugging, and press Connect. Everything your PC does online goes through the phone: browsing, apps, updates, calls. If the phone is on a VPN, PC traffic exits through it too, so the PC shares the phone's VPN and exit location. Nothing is installed on the phone: a small helper runs on demand, so Android's battery saver cannot freeze it. On the PC it sets up a virtual network connection in the background. If the link drops, the PC stays offline instead of falling back to the local network, so traffic cannot leak out. IPv6 is blocked and address lookups stay inside the tunnel. Disconnect removes the routes and DNS settings it added; close the app and the PC is back on its normal network. Free and open source (MIT). Needs Windows 10 1809+ / 11 (64-bit) and an Android phone with USB or Wi-Fi debugging.

EllixVPN is an application that make sure you are always connected. If your VPN or dialup modem is always disconnecting, then, this application (software) is for you. This application is for you that browse/download a lot and want to be always connected.

Lomalarga is a port forwarding (VPN-like) service based on SSH & Linux. Based entirely on open source. The client is written in C# and the administration is based on Linux/lighttpd/PostgreSQL/PHP, with the UI written with Google Web Toolkit.

*It stores VPN Details in a SQL Database. *Enables users to all share VPN Connections *Connections are automatically created on client machine if it does not exist. *Can be run from the command line and passsed arguments if needed

VpnHood is a free, open-source VPN platform designed to provide encrypted connections and help users bypass restrictive network firewalls. Developed in C# and .NET, it uses traffic tunneling methods intended to resist deep packet inspection. The application supports UDP, TCP, QUIC, and cloaked connection modes. Users can establish VPN connections through a straightforward interface and configure application or country-based split tunneling. It also supports custom DNS settings and several proxy protocols. Its server component provides user management, persistent sessions during restarts, and flexible deployment options. Available for Windows, Linux, Android, and iOS, VpnHood combines VPN client functionality with tools for operating private VPN infrastructure.

Tiny Security Suite is a software that consists of encryption, shredding, VPN, folder hiding, Firewall, and Tor Browser. Tiny Security Suite has: - File Encryption (AES and Triple DES) - Text Encryption (AES and Triple DES) - Shredder - Secure Folder (Folder Hider) - VPN (uses OpenVPN configuration files, need openVPN installed on computer) - Tor Browser - Firewall (Firewall PaPI)