A documentation website generator for open source. No need to pollute your Github repo with html+css+etc etc files, just write markdown and point your domain there and it'll render it. Example output for a paid project (my own):

https://statux.dev/

The main fear from multiple people is that the project might "go evil" at some point and add ads or similar to project's documentation. I definitely don't plan on that (that's why I'll charge for premium features!) but totally understand the fears. The project is already "successful" for myself, so how can I dispel these fears from other devs?