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Ganeti
Ganeti is a virtual machine cluster management tool built on top of existing virtualization technologies such as Xen or KVM and other open source software.
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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.
It's funny, Google developed their own hyperconverged stack back in 2007 because it didn't want to give vmware any money. They had couple of engineers to build Ganeti rather than pay for all the vmware licenses they needed for corp office infra.
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.