One of my favourite programs, esp. on my NeXT Cube. My wife wrote her Master's Thesis in WriteNow v2 on a Mac SE which I somehow managed to get printed on an HP LaserJet (IV I think it was --- the nice 600dpi one) at the college.
WriteNow was ~100,000 lines of assembler code.
It had an interesting history --- it was developed under contract for Apple as a hedge against MacWrite not making it --- when it was ready, they allowed it to be sold separately, then when Steve Jobs left Apple, it wound up getting ported to NeXTstep and for a while was bundled w/ Cubes until that was given up as anti-competitive.