Vimsical is fine-grained version control system mainly built to record coding tutorials.
demo: https://vimsical.com/vims/5969777d-8dae-48a6-8b6c-838928b59382
code: https://github.com/vimsical/vimsical
demo: https://vimsical.com/vims/5969777d-8dae-48a6-8b6c-838928b59382
code: https://github.com/vimsical/vimsical