Ranked in these QuestionsQuestion Ranking
Pro Free with no limitations
Both public and private repositories cost nothing to host. You can have any number of them as well as any number of collaborators. The platform itself is also free (libre) and open source software.
Pro Fossil support
This means you get a wiki and a bug tracker that you can work with locally offline and both are version-controlled. You are also able to customize, e.g., the look of your project's repository if you want to.
Con No support for Git, Mercurial or SVN
Git especially is the most popular version control tool out there, followed closely by Mercurial and SVN, and Chisel supports neither of them.