Fork is wonderful, a well-designed and performant Git GUI, native on each platform (Windows and macOS).
I bought a license a while back, since I use it every day. That said, I believe they're moving towards a "trial" model, rather than "free" as in beer.
I do wish it was open sourced, but also wish them the best in making it a profitable venture. It's great software, it deserves good funding so the creators and users can benefit from it.