Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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Linux has been treated as a second class citizen by Proton with pretty much all their products. Just look at the state of the ProtonVPN client compared to Windows. They are simply allocating less resources to Linux development in general compared to other platforms.
FWIW, the Mac client lacks features found on Windows, but not as severely.
I kind of understand it though. Their official client is gtk based, there are distros that use qt, other distros don't use anything at all and instead the user build it. I ended up using wireguard/openvpn directly and just downloading proton config files and it worked greatly.
If they just provide a good server infrastructure and a reasonable app that works well on famous distros e.g Ubuntu, Fedora, it's enough