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TrinityCore
TrinityCore Open Source MMO Framework (master = 10.2.6.54358, 3.3.5 = 3.3.5a.12340, wotlk_classic = 3.4.3.54261, cata classic = 4.4.0.54027)
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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.
Trinitycore has 3.4.0 for Wotlk classic but it's pure sandbox. It's so much work to be done so don't expect it to be released. https://github.com/TrinityCore/TrinityCore/tree/wotlk_classic
NOTE:
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Hence, a higher number means a more popular project.