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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.
Checkout https://textpattern.com/ - its development started around the same time as WordPress, and still continues. Even though it didn't reach Wordpress' success, I've always felt that TextPattern is better coded than WordPress.
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.