After long hours googling around, I'm wondering if there really exists a maintained gui based on Ruby.
Here are the one I checked:
Shoes: I'm not feeling like I could create rock solid platform with it
Cocoa and MacRuby: no fresh news, almost no tutorial
Qt4Ruby: same as above
FxRuby has almost no update
...
To be short, I've looked at all gui presented here but am not convinced...
So:
Am I unable to find the proper doc for Cocoa and Qt? (I'd like it to be the answer!)
Is there any strong community based on a maintained Ruby gui? (please say yes again!)
MacRuby isn't a GUI. MacRuby is an implementation of Ruby that instead of C, makes use of modern tools like LLVM and an Objective-C implementation. This eventually allows it to communicate with Cocoa, with a "bridge".
It's a work in progress. Current version is 0.10; and the last source activity was 7 hours ago right at this moment, so I don't see the point of saying "no fresh news".
Regarding "almost no tutorial", have you checked the home page? The area called Documentation has many of tutorials, screencasts, recipes and these things.