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commentoplusplus
Commento with out of the box patches and updates to add useful features and fixes. Also with one-click deploy to Heroku so you can get up and running fast.
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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.
I use Commento++ with third party auth, but looking at the settings page I do see single sign on in the configuration options.
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.