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https://exercism.org/ is a pretty decent spot, I think.
There are solutions from scala center available too: https://github.com/scalacenter/scala-advent-of-code
handsonscala is a great read for programming in general using scala. Especially if you're the practical kind of learner.
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.