A major competitor to Typo3 is Mambo CMS. The two projects are organized rather differently, but both run on a LAMP platform and each boasts a worldwide following. Here is a nice story on the history of the Mambo project, with additional perspective on their recent legal travails...
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RSG's next Stack Leadership Council peer-group gathering will gaze into the future.
It seems time for an answer to the question: what is Sitecore, really, circa 2023?
See how to re-think your Web CMS for a new era.
Some TeamSite implementations linger on, like a really bad relationship you can't seem to end. Maybe it's time for a clear exit?