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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.
If you have access to Linux, there's a community tool called LGOGDownloader that can download your whole library or selected parts of it in one go. It can also list any local files that aren't in your GOG account anymore, e.g. older versions of updated games. I use it regularly to keep my offline library of 600+ games up to date.
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.