Alternatives to IntelliJ's Git Interface?

For a number of years, I've been a fan and dependent on IntelliJ's interface for Git commits.

It's still great, but II also seems to be collapsing under the weight of its own development, and it's never been FOSS, another drawback.

Does anyone know of any similar alternatives, ideally from the FOSS world, which will allow me the below functionality:

List and select files which have changes

View side-by-side diff of individual changed file

Select changed sections for inclusion in commit

That's really about all I need, since I'm developing a branchless "everything on master" solo project.