I found a series of papers about HyperFlow, a data flow visual language for tablets: http://web.archive.org/web/20200803001819/https://hopl.info/showlanguage.pr

I found a series of papers about HyperFlow, a data flow visual language for tablets: http://web.archive.org/web/20200803001819/https://hopl.info/showlanguage.prx?exp=5322 http://web.archive.org/web/20200803001819/https://hopl.info/... I'd also be remiss to not mention Ken Perlin's Chalktalk project, though that's mostly a presentation system as it stands: https://github.com/kenperlin/chalktalk https://github.com/kenperlin/chalktalk These are both largely graphical and gestural, with a good number of low-stroke symbols instead of handwritten strings for the most part.