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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.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
A few days ago I saw some guys in this community saying that they uses https://www.etesync.com/ in order to sync contacts between Proton + Thunderbird (Desktop) + Mobile. I haven't used it yet, but I saved the link.
Check their website : https://www.davx5.com/
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.