The Samsung Note3 (and presumably later versions) come with S Note (which I just found is also available for windows[1]) -- and does a decent job of translating hand-drawn equations (eg sum over x=0 to infinity for 1/x). Not sure about the pc version (yet). Might be worth looking at for those that have a windows tablet/device with stylus input.

[ed: Doesn't appear to be a feature of the windows/desktop app :-( ]

[1] http://www.samsung.com/uk/apps/mobile/snote/

There's also this one for iOS, which is pretty impressive (and has direct Latex output): https://itunes.apple.com/us/app/myscript-mathpad-handwriting...

Don't think this is by the same people, but I've used https://play.google.com/store/apps/details?id=coolcherrytree...

I've wanted this for years. I believe it's still an area of research, due to (among other things) the two-dimensional nature of written mathematics.

I remember how bad my Palm Pilot was at that... It didn't even make sense why they added this "capability".