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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.
Try open edx, its open source lms and free but need technical knowledge to deploy and host on your own server. Here's the link : https://github.com/openedx/edx-platform The platform described as "Open edX® was created by the joint efforts of Harvard University and MIT for the well-known learning platform edX. It is an open-source, learning management system (LMS) that empowers organizations worldwide to design customized and engaging online learning platforms.5 Jul 2021"
NOTE:
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Hence, a higher number means a more popular project.