I know about Fossil but are there any alternatives? Something small and easy to install/configure.
Trac is a widely used alternative.
An extensive list of project management tools is maintained on Wikipedia.
I know there are quite a few git-based wikis such as git-wiki, WiGit and gitit. A simple google search will bring up many others, I'm sure.
I also know of some git-based bug trackers such as ticgit which basically lets you keep your tickets in a separate branch of a git repository. There's also DisTract.
But I'm not aware of anything else aside from Fossil that really tries to do what it does in one combined tool.
I'm curious what your experiences with Fossil have been. It's one of those things I find interesting but not been in a position to actually use as yet.
There is file-based bug tracker Artifacts. It keeps data in you version control system of choice, but works on Windows only (integrated with Visual Studio) - not sure if that suites you.