In the past months, I have been busy working in partnership with other developers to port some of the FotoSketcher algorithms to platforms other than Windows.
I am happy to introduce you to a very nice app for the Mac, simply called Sketcher, which you can download here: http://neatberry.com/products/sketcher/
Even though it is not free, it is very reasonably priced. Here is a screenshot:
As for Android, there are two versions of the PhoneSketch app.
One is 100% free (but doesn't allow you to save your works of art): https://market.android.com/details?id=com.wimolife.PhoneSketchFree&feature=search_result
The full app is very affordable: https://market.android.com/details?id=com.wimolife.PhoneSketch&feature=search_result
Here is a screenshot:
I hope you will enjoy playing with these apps.