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drupal-spec-tool
A tool for specifying Drupal architecture details and generating automated tests for them.
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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'm using the spreadsheet from https://github.com/acquia/drupal-spec-tool just for helping to map out the content types, fields, etc that I had on my old site and will need on the new site. (I'm not using the full tool for building tests).
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.