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I would like to see Git be extended with a decentralized approach to bugtracking, code reviews, wiki's for documentation etc.

Isn't that Fossil?

What do you need for wikis? Just put text files in a folder?

Repeat after me: Git is more than just files. Git is more than just files.

Yes, it's also good a variety of different systems to store and address Markdown.

Which you could, you know, put in git.

Git is more than just GitHub though, that much is true.