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netatalk-2.x
Discontinued Netatalk is an Open-Source AFP file server for Linux, NetBSD, and Solaris, capable of serving AppleShare over AppleTalk and TCP/IP with multiple Macintosh or Apple II clients.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can check out my Netatalk fork which have stable releases that have been tested on modern Linux distros. https://github.com/rdmark/Netatalk-2.x
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.