I just released "Plaid", a Mac app for making responsive web layouts. Check it out here:
http://plaid.gs/
The entire app was written in Nu. 100%. It's about 2600 lines of code. I had tried to do it all in Objective-C originally (before I discovered Nu), but I found the strictness of the language really detrimental to discovery. Randomly, I stumbled across Nu (being a LISP advocate myself). My productivity skyrocketed. Seriously. It was so easy to develop with. Want a new class? Add it right there! Want to filter a huge list and apply a function to its result? Do it in one line! The lines of code going from Objective-C to Nu were reduced at least by 50%, if not 70%.
I'm incredibly grateful that this language exists and that it works so well. (Thank you, Tim Burks, for your effort with this!) I just wanted to encourage others to use Nu for production Mac apps. Plaid was accepted by Apple without any issues. I never even used Xcode.
I may in the near future release some tutorials for Nu, as I learned a bunch while making Plaid (such as how to do Document-based apps).
Here's to Nu!
Cheers,
Thomas Klemz
Software Engineer
Lory and Ludlow LLC