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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.
Even idTech 3 used third party components as listed in the description here: https://github.com/id-Software/DOOM-3-BFG. Newer versions of idTech use Vulkan for rendering. For that, they are basically forced to included the header files of Vulkan which are licensed under Apache 2. So it has to be mentioned somewhere.
NOTE:
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Hence, a higher number means a more popular project.