...Built with Python or C and leveraging the GTK framework, this app provides intuitive controls for server selection, connection management, and status reporting, integrating with Linux system networking and user session environments. It supports features expected of a full VPN client—such as secure tunnels, automatic reconnection, and location selection—while respecting desktop conventions like system tray icons and notifications. The GTK client helps bring ProtonVPN’s privacy-focused service to the Linux ecosystem in a way that fits naturally with widely used Linux DEs, making secure connectivity accessible to users who prefer open systems for development, business, or privacy reasons.