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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.
A free theme that I like is Understrap (https://understrap.com/). It has single post templates. You can easily customize the templates in a child theme. I believe most themes have single post templates but Understrap's php is easy to modify, along with the html and css.
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.