Our great sponsors
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Signal-Server
Server supporting the Signal Private Messenger applications on Android, Desktop, and iOS
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k-9
Discontinued K-9 Mail – Open Source Email App for Android [Moved to: https://github.com/thundernest/k-9] (by k9mail)
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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.
Signal's server software is open source as well. See here.
K-9 Mail
Fairmail
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.