How can I create excellent documentation for my open source project?

Question

After completing an open source project, you should have a reliable documentation site so that people can understand how to use this code.

Examples of good documents that I came across:

http://guides.rubyonrails.org/

http://vowsjs.org/

http://codeigniter.com/user_guide/

http://expressjs.com/

I had never created any documentation on the Internet before and would not like to hear some suggestions about tools that you can use to easily create accurate documentation like the previous ones.

Also, does anyone use Drupal to create documentation?

Answer 1

pdoc,