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Proton

Encrypted mail, calendar, drive, VPN and passwords from one Swiss company.

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Alternatives to Proton

All of Mail & messaging

ThunderbirdMail & messagingFreeMail, calendar and contacts for all your accounts in one app.
ElementMail & messagingFreeTeam chat on the open Matrix network, encrypted end to end.
SignalMail & messagingFreeEnd-to-end encrypted messages and calls, run by a non-profit.
Silent CircleMail & messagingPaidEncrypted calls and messaging for businesses and organisations.
Jitsi MeetMail & messagingFreeVideo calls straight from a link, with no account needed.
MattermostMail & messagingFreeChannels and threads like Slack, on a server you run.
KeePassXCSecurityFreePasswords in an encrypted file you keep, with no account at all.
NextcloudStorageFreemiumThe popular open-source, self-hosted cloud for files, calendar and chat.

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