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Open Build System and OpenQA, for automated building and testing of packages. This is what gets updates to their rolling release Tumbleweed faster than Arch, but with no instability ever. I can't emphasize enough how rock solid Tumbleweed is. OBS also doubles as their own AUR equivalent - you can make your own repo and do your own builds and install from the command line, or browse and install what other people have…
I have been using Tumbleweed for a few years now, but while it seems like a stable rolling release distribution, I am not quite sure about the "rolling release" part. Each month, a new snapshot comes out, which upgrades every single package you have installed, regardless of whether there were actual upstream updates. With a full Texlive installation and just a few more suites this amount to roughly 10,000 packages an…
That's called a trade-off, a very fundamental concept in pretty much everything in life.
And no, snapshots don't come out every month. They come out ~5 times every week. The most number of packages I've had to update was maybe around ~3500 and that's after 6 month of not upgrading my system.
I agree for "true" rolling distro enthusiasts, Arch is still the top choice, but Tumbleweed is great for those seeking to use a rolling distro without sinking too much time into configuration.