How to get CardBook in Thunderbird to sync contacts with CardDAV or other type of connection?

This page summarizes the projects mentioned and recommended in the original post on /r/ProtonMail
Carddav Caldav Protonmail SMTP Webdav

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  • hydroxide

    A third-party, open-source ProtonMail CardDAV, IMAP and SMTP bridge

  • davx5-ose

    DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.

    • Is this different or better than https://www.davx5.com/ ?

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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