Practice Kanji Writing on Mac's Trackpad

Interesting enough, you can use the trackpad on a mac to practice writing Chinese or simplified Chinese characters. (support.apple.com/kb/HT4288) This can also be used to practice writing Japanese kanji. It is worth noting that it can not be used to write all Japanese characters because some kanji have been changed from their Chinese or simplified counter parts. I do not know enough to give any specific examples, but it is well documented in my learning Japanese books to know that this is the case.

If you want to give it a try, use the Apple support page to read how to enable the feature.