The Coveralls service was designed with Ruby and Rails projects in mind, so we released Coveralls.io in 2011 along with the original Ruby gem:
Since 2017, other members of the community have taken up the charge of maintaining and building upon the original.
At this time, the following gem appears to be the most active and well-maintained fork of coveralls-ruby:
Alternatives and more recent additions:
covered - Covered uses modern Ruby features to generate comprehensive coverage, including support for templates which are compiled into Ruby.
If you know about other forks of coveralls-ruby that are also active and well-maintained, or alternative implementations that integrate Ruby and Rails projects with the Coveralls.io service, please let us know about them at email@example.com