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libphonenumber
Google's common Java, C++ and JavaScript library for parsing, formatting, and validating international phone numbers.
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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.
For instance, the XML file https://github.com/google/libphonenumber/blob/master/resources/PhoneNumberMetadata.xml contains Phone number metadata with possible lengths, broken down by countries.
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.