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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.
Nextcloud. This is a server application that lets you essentially create the entire Google Docs/Drive suite of tools. You can install the Music app, which will act as a front-end to any music you upload (web-interface for listening).
Check out Handbrake.fr, free and open source.
NOTE:
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Hence, a higher number means a more popular project.