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govuk-form-builder
A form builder for Ruby on Rails that’s compatible with the GOV.UK Design System.
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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 dig around on GitHub you'll see most government departments have an organisation where they publish stuff. For example, here's the MoJ, DfE, Cabinet Office.
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.