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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.
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steamtinkerlaunch
Discontinued Linux wrapper tool for use with the Steam client for custom launch options and 3rd party programs [Moved to: https://github.com/sonic2kk/steamtinkerlaunch] (by frostworx)
There's also a Lutris flatpak I can recommend: https://github.com/flathub/net.lutris.Lutris
Shameless self promotion: https://github.com/igo95862/bubblejail
Might not help you for everything, but steamtinkerlaunch (in AUR) has an easy-to-use option to block internet per game (technically it unshares the whole network for the game. Only did basic testing, but it \workedforme*)*