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AbyssEngine
Abyss Engine clean-room reimplementation of Diablo 2, written in C. The goal is to recreate the original game engine, but on a portable platform that can also easily be modded and extended.
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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.
From what I see it's not abandoned. The last commit is 2 days old: https://github.com/AbyssEngine/AbyssEngine
NOTE:
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Hence, a higher number means a more popular project.