External Review References
These are some of the sources we've used to compare Trac and BitBucket
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Github vs Bitbucket
Bitbucket and Github are very closely matched in terms of features if you need to use Git. And if your VCS is Mercurial, then it’s only Bitbucket for you. Each has some useful features not found in the other, such as Github pages for small web-hosting projects, or Bitbucket’s JIRA integration.
7 Best GitHub Alternatives
Bitbucket is second only to GitHub in terms of popularity and usage. Bitbucket is free for individuals and organizations with 5 users or lesser, and it lets you have unlimited public and private repositories. Bitbucket allows you to push files using any Git client, or the Git command line.