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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.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Like you said, you do need a bunch of other repos that you just want to use as-is and not necessarily commit to. There is a tool that manages sets of git repos (or svn repos, hg repos, and even zips): https://github.com/dirk-thomas/vcstool
ROS 1 uses files like this in some places. ROS 2 currently uses one and you can vcs import it to clone the many many git repos that make up the source code of ROS 2: https://github.com/ros2/ros2/blob/master/ros2.repos