K3UL

I don't understand how a diagram tool like this doesn't exist yet. I've also had this on my Christmas list for so long, where it would apply for any kind of diagrams or mindmaps

As someone who's been using it at very large scale, I still miss gitlab but I think they are not that bad.

But two major pains I did not see : the atrocious UI and the pricing.

Their pricing model goes against any good practice, as it counts a minute for any job even if it runs for 2 seconds. Let's say you run 100jobs in parallel and they all take 30sec. You will pay 100 minutes instead of 50. Now translate this to an enterprise operating at a big scale and I assure you have seen crazy differences between actual time and billable time.