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As /u/transhumanist2000 said, the only other one I've seen that looked heavily supported and had a sizable following are dot net nuke, and I'd add, Umbraco (https://umbraco.com/). Unfortunately I haven't heard the best of feedback about these cmses.
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.