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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.
You can read the complete source code here. For more details on metaprogramming in Ruby, read my notes of the Metaprogramming Ruby 2 book.
Propshaft is an asset pipeline library for Rails. It uses OrderedOptions to define the config.assets settings, instead of creating a new configuration object. You can read the complete source on Github.
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.