Keybase alternatives
Programs you can use instead of Keybase. Free and open-source options come first; every download is from the publisher's official source.
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Signal
Signal is an open-source, encrypted messaging application focused on user privacy and security.
Shared platforms: Windows, macOS
WindowsmacOSLinuxAndroid
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Element
Element is an open-source messaging and collaboration client operating on the decentralized Matrix protocol.
Shared platforms: Windows, macOS
WindowsmacOSLinuxAndroid
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Gpg4win
Gpg4win is an open-source encryption package for Windows based on GnuPG technology.
Shared platforms: Windows
Windows
Other alternatives not on the site yet: Proton Drive