There are many great pieces of novel writing software to aid writers. Above is a link to Storybook, a free open-source program to help you keep track of characters, chapters, plot progression, and pretty much anything else you can think of!
You can write directly in the program and later convert your work to easily usable formats like Word and html.
(As I said- there are many programs like Storybook available, so if this one doesn’t seem to fit, don’t give up!)
(ALSO! There are similar programs specifically for comics, plays, and almost anything else you can imagine. Now get to writing!)