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Silent Circle

Encrypted calls and messaging for businesses and organisations.

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Alternatives to Silent Circle

All of Mail & messaging

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ProtonMail & messagingFreemiumEncrypted mail, calendar, drive, VPN and passwords from one Swiss company.
MattermostMail & messagingFreeChannels and threads like Slack, on a server you run.
ThunderbirdMail & messagingFreeMail, calendar and contacts for all your accounts in one app.
Ente PhotosStorageFreeEncrypted photo backup with face search and shared albums.
KeePassXCSecurityFreePasswords in an encrypted file you keep, with no account at all.

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