There is a number of good documenting tools for Django REST Framework, especially Django REST Swagger: http://www.django-rest-framework.org/topics/documenting-your-api/
All of them are for online usage. Is there a tool to generate offline documentation: PDF or a collection of HTML/CSS-files? Something like http://sphinx-doc.org/ does?
Assuming you've the Swagger spec file (JSON/YAML), you can use Swagger-Codegen to generate the static documentation for your REST API.
UPDATE: On May 2018, about 50 top contributors and template creators of Swagger Codegen decided to fork Swagger Codegen to maintain a community-driven version called OpenAPI Generator. Please refer to the Q&A for more information.
