Personally, the built-in fossil ui has been all the GUI I need for small projects.
After fossil new and fossil open, the only real interaction with a repository for a personal project is the occasional fossil changed and fossil extra to make sure I didn't change anything I didn't intend to change, and naturally fossil ci to check in those changes.
For browsing the repository fossil ui does everything I need. It is hard to beat the Timeline view, from which you can get to the files changed by that check in. There is also the Files view, from which you can see each file and inspect that file's timeline.
There is also a project in progress to write an introductory book for fossil. The current draft is well worth reading.