Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
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Bugsnag exception handler
Doctor shows you how TYPO3 is doing
Create and add rich content to your website for free. Some examples of what you get with H5P are Interactive Video, Quizzes, Collage and Timeline.
Removes [deleted/hidden] records older than [N] days from tables
TYPO3 Migration Tools