2. Linux GuiGTK3 GUI client with systray, for ProtonVPN. Works on top of linux-cli.
3. VpncoreCore application code shared between the iOS and macOS apps
4. Linux CliLinux command-line client for ProtonVPN. Written in Python.
5. Protonvpn CliLegacy protonvpn-cli: ProtonVPN Command-Line Tool for Linux and macOS. This has been superseded by https://github.com/ProtonVPN/protonvpn-cli-ng