Comment by kasperpeulen

I recently made this little tool for writing latex macros: http://kasperpeulen.github.io/PressAndHold/ It works the same as the OSX press and hold accent picker. I have also a unicode version which I think is much more appealing for young mathematicians: http://kasperpeulen.github.io/PressAndHold/Unicode/

All MIT licensed if you are interested in using it.