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lgogdownloader
LGOGDownloader is unofficial downloader to GOG.com for Linux users. It uses the same API as the official GOG Galaxy.
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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.
https://sites.google.com/site/gogdownloader/ I found it in my AUR repository so I expect it to be in the repository of whatever distribution you might choose.
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.