AskHN: How do people write novels these days?

I typically write on paper, with a wonderfully smooth, permanent pen. Oddly, having no option to erase or edit results in generally improved writings.

I suppose it's phycological. Without the the ability to backtrack and edit earlier paragraphs, there's no temptation to optimization preemptively, and I can focus on larger concepts, rather than minute details. However, it does result in grammatical hell, and I normally resort to MS Word-based refinement before distribution of any kind.

Graduation is next week, and I've decided on a potentially-indefinite gap instead of college. With newly available free time, I plan to continue hacking away, but also to write at greater length. There's a story that I've begun developing, which I'd love to put into full form.

At this point, I've done a large amount of writing, but most of my experience is in short (<10 page) journal entries. I seriously doubt triple-digit page-counts are handled on straight paper, or in MS Word for that matter. That said, how are novels written these days? Are there any GitHub-like services that specialize in prose?

I dunno. Thoughts?