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It's natively integrated (meaning it can directly be started and used as network back-end) but distributed separately. There are packages for Arch Linux, Debian, Fedora, openSUSE, Ubuntu, with Alpine and Void Linux on the way.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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.