Fossil's intended use case is different from Git's; it was originally built as the VCS for SQLite. In terms of its target audience, it's basically GitHub-in-a-b

Fossil's intended use case is different from Git's; it was originally built as the VCS for SQLite. In terms of its target audience, it's basically GitHub-in-a-box for small or medium-sized teams. Implementation/usability-wise, it does some things better than Git, does other things worse, and yet others simply different (in a way that some may find better, some may find worse).