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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.
All Doom engine based games. There's already Doom with RT, and I've heard that someone already created lighting data for Doom 2, but there's also Heretic, Hexen and Strife. Especially Hexen! It looked pretty awesome as it was those days at 320x200, it obviously looks light years better running on modern engines, but I imagine it being absolutely mind-blowing with RT.
NOTE:
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Hence, a higher number means a more popular project.