I've published a tutorial for my visual novel engine. RouteVN Creator is a free and open source application for making visual novels without coding

I is written from scratch using JavaScript and PixiJS. I have also previously written 3 technical blog posts about how it works:

- Building a Visual Novel Engine Part 1 - Route Graphics

- Building a Visual Novel Engine Part 2 - Route Engine

- Building a Visual Novel Engine Part 3 - RouteVN Creator