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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.
If you want to run Windows, xen is a non-starter:
https://github.com/xcp-ng/xcp/issues/105
Proxmox / KVM is the only better alternative to ESXi that can support all of Windows security mitigiations such as Core Isolation, which requires nested virtualization
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.