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Overte
Overte is an open-source 3D client and server solution that allows for vast social & educational environments to be created and lived in while also being shared in real-time with others.
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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.
Philip Rosedale (the Second Life guy) after a while left the company and started something called High Fidelity. That was something like SL 2.0 design-wise and was built with VR support from the start. This also died eventually and got picked up by volunteers, which is what I do now :)
NOTE:
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Hence, a higher number means a more popular project.