tortoisegit: develop a *proper* GNU/Linux alternative
Port TortoiseGit and related tools like TortoiseMerge* et al to GNU/Linux. In the future, this could be expanded to TortoiseSVN and TortoiseHg.
(*) Although Meld may already be good enough.
I was going to try and improve upon RabbitVCS at first, but the code base is just too horrible, both in terms of design and quality. We can do better justice to TortoiseGit, which on the other hand is very high-quality.
And yes, I'm aware of many graphical Git helpers on GNU/Linux; I currently use VS Code. But to me, nothing beats a shell extension.