Kivy seems well designed and easy to use - not just for multi-touch but general cross platform UI apps, and phone apps.
My only concern is that the community seems small and the site a little dated?
My only concern is that the community seems small and the site a little dated?
I've never had any issue installing PyQt (or PySide) whatsoever, though I usually use Conda [1] with the Anaconda Python distribution, rather than the system default (which you shouldn't use, IIRC) or the official one from Python.org.
The easiest way to get started is probably with the Miniconda [2] Python distribution.
I'm not sure if Conda pulls down Qt, though, or if you have to install that yourself (e.g. via Homebrew).
[1]: https://github.com/conda/conda [2]: http://conda.pydata.org/miniconda.html
This will also let you use the given platform's native interface widgets.