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gogrepo
Python-based tool for downloading all your GOG.com game and bonus collections to your local computer for full offline enjoyment.
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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.
What I have found that works best is using the gogrepo python script. It can run on Windows, Linux, and Mac OS using Python. The script is pretty simple, you login once via command (documented on the github README) and then you can download your entire GOG library including extras and other platforms. All the files will be the offline installers that you get from the website.
NOTE:
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Hence, a higher number means a more popular project.