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forked-daapd
Discontinued OwnTone is forked-daapd's new name! Linux/FreeBSD DAAP (iTunes) and MPD media server with support for AirPlay devices (multiroom), Apple Remote (and compatibles), Chromecast, Spotify and internet radio. [Moved to: https://github.com/owntone/owntone-server]
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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.
The network features for iTunes are very limited and that's all Synology works with. Knowing them whatever tool they used is based on open source tech, probably this: https://github.com/ejurgensen/forked-daapd
NOTE:
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Hence, a higher number means a more popular project.