GitButler
Desktop app Replaces it Active Source-available · FSL-1.1-MIT Linux Arch/AUR
Pre-1.0 and built around parallel virtual branches, so it works quite differently from GitKraken's commit graph.
Imports your data: opens your existing Git repos; nothing else carries over
Install
$ yay -S gitbutler-bin$ flatpak install flathub com.gitbutler.gitbutler