To me the post sounded as if the poster was suggesting they're were no other cool development tools that were on-par with Cappuccino, thus we should all mourn if they stopped developing. The poster if you recall was not a Cappuccino developer.
It's in my opinion, and I'm sure in many others, that there are many other cool development tools, some of which are on-par, if not better in various ways than Cappuccino, many of which don't get the attention or appreciation they should get.
Don't underestimate this effect.
I stand by what I said: Merely stating that there are "other cool tools" is empty. Somebody else may as well respond, "Nah, other tools suck." Since we're not talking about anything in reality, nobody will be right or wrong, and nobody benefits from reading any of it.
I really don't know of any comparable tools that are on par with Cappuccino. There's SproutCore, but at least last time I checked, it seemed to be the lesser in every way except not being dependent on that beast called Objective-J.
You can disagree with it, but I refuse to start any discussion with you. It's obvious from your tone and content that you don't intend to actually have a meaningful discussion.
I've recently been reinvestigating these Web app frameworks for a new project and not finding much that I loved, so I really did hope you had some useful insights. But oh well, I guess.
There are a lot that do a part of it, but none I've seen that are complete and are not plugins. And what about something that comes anywhere near atlas/interface builder+nib2cib?
I'm genuinely interested. Now, I need a backup plan in case atlas never comes out alive. :)
I didn't know of any but I haven't searched extensively (I was keeping it in mind for a future project). I just know that people on HN had given it universal praise, and HN can be a tough crowd.
I'm all in favor of a diversity of awesome development tools. Even though I use Ruby, I would be sad if Python went away. I use Lisp, but I would be sad if Haskell went away. I use emacs but would be sad if vim went away.
I'm dying to see that list of yours. I hadn't heard of noloh before but thank you for bringing it to my attention. Just remember, if you want your dev tools to be successful, you need to get people talking about them. Best of luck!