Fossil alternatives and similar tools

Based on the "Version control" category.

Git

9.9 9.9 L2 Fossil VS Git

Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documentation/SubmittingPatches procedure for any of your improvements.
Subversion

4.4 9.3 L2 Fossil VS Subversion

Mirror of Apache Subversion

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GNU Bazaar

- Fossil VS GNU Bazaar

Distributed revision control system sponsored by Canonical.
Mercurial

- Fossil VS Mercurial

Another distributed revision control.
Darcs

- Fossil VS Darcs

Patch-based distributed version control (more info: wiki)