Reviews and Ratings
I personally use Fossil because it's amazingly efficient. It's one simple program with no dependencies, I can put it anywhere and use it, needs no libraries or admin privileges.
It even has a built-in web server, which I can use to set up a collaboration platform quickly almost anywhere, with a few changes to Nginx config, or even without a front-end, as Fossil can handle HTTP directly. It's written with C and is so fast, that I can set up as many projects as I want and see zero footprint on server resources.
Generally, I think that Fossil is what a good program should be. Not bloated, written in another new language with another runtime library for every function, using hundreds of files because you can always add more RAM, but small, fast and easy on resources, because that's enough.