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This + GitLab might prove to be a great alternative to GitHub Enterprise.

Surely this replaces GitLab as well?

I don't see any indication it comes with a web UI like Github/Gitlab.

There were screenshots shown during the re:Invent keynote. It looks remarkably similar to GitHub.

The only screenshot I can find is https://media.amazonwebservices.com/blog/2014/code_commit_ma... but that looks like it's just a code browser. No issues, PRs, etc.

Yep, it's only revision control plus user interface.