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InfluxDB
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I wrote this language summary for coworkers a few years ago: https://github.com/jbodah/ruby_for_experienced_developers
I can't find the link to the official announcement, but many years ago they published an official ISO for Ruby, however at the time the ISO was based off of 1.8.7 syntax/semantics. Other than that, you have the RubySpec project which is a series of tests that validate how Ruby should work.
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.