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AreWeAntiCheatYet
A comprehensive and crowd-sourced list of games using anti-cheats and their compatibility with GNU/Linux or Wine.
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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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GameNetworkingSockets
Reliable & unreliable messages over UDP. Robust message fragmentation & reassembly. P2P networking / NAT traversal. Encryption.
There are a few. I tested ARMA 3 myself a while back and it worked fine.
Kinda :)
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.