GitUp is such a great app & fantastic UI design, but the author gave up on it at maybe 80% of functionality, and I think for that reason (among perhaps others), it never really caught on. (It's open source and there are still occasional commits, but it doesn't seem to be really actively worked.)

Nevertheless my main daily driver, along w/ the command line. It's undo capabilities, best-in-class visualization of the timeline, and ability to easily visually edit, reworder, and squash commits remain amazing.

(I was disappointed to see newer git clients like Submlime Merge did not take inspiration from GitUp.)

Ultimately I think the future of VC will be something patch-based (pijul?) w/ a UI along the lines of GitUp.