When we are working on a project, we are writing a lot of documentation about the project, how works the application...
Depending on the documentation, generally technical people need access to, but sometimes you want to let it available for non-technical people. But they don't know how to use github (or don't have the access if it's a private project) or else to go to your markdown files.
So here are useful tools to be able to generate a static website from your markdown files.
I hope it will help you!