Mullvad is a commercial open source VPN service. On the market since 2009

"Review of the VPN service Mullvad from Sweden, which has been on the market since 2009. VPN is paid, costs 5 Euros per month, but the tariff includes support for five devices. It has a huge number of servers in different countries and open source code. Quite convenient and easy to use. You can download the application for Windows, Mac, Linux, Android and so on, or generate a configuration file for WireGuard or OpenVPN."