VPN stands for “Virtual Private Network.” When you connect to a VPN, all data that you send (such as the requests to servers when browsing the web) appears to originate from the VPN itself, rather than your internet service provider (ISP). This masks your IP address, which can be an...
What isn’t free software…?
I think you should make it clear if you are talking about VPN services or client-side apps here. If they provide normal standard protocols like Wireguard and OpenVPN, they can be used without having to install any provider-specific apps.
Regardless of provider it’s generally preferred to use third-party software to connect. VPN providers that don’t even have their own apps don’t qualify as good for you either?
Demanding the whole stack be FLOSS is a bit silly in this context. None of the ones you mentioned open-source most of their backend systems either AFAIK.
I think you should do your homework better before you speak so widely and absolutely dismissively with such claim of authority. It is not helpful.