-
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.
I've seen it in SDL2_image source and also Hashlink repository. They included other dependencies but removed SDL2 in their source code (gitignored it).
Finally, if you want to vendor your dependencies (there are plenty of legitimate reasons for it), you probably want to use a tool that does it correctly, like Google's Copybara.
I wouldn't call 80 commits in the past month "not going quickly".
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.