What are some alternatives?
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Sphinx Search - Sphinx is an open source full text search server, designed with performance, relevance (search quality), and integration simplicity in mind. Sphinx lets you either batch index and search data stored in files, an SQL database, NoSQL storage.
Daux.io - Daux.io is a documentation generator that uses a simple folder structure and Markdown files to...
Slate API Docs Generator - Create beautiful, intelligent, responsive API documentation.
SkyDocs - SkyDocs is a lightweight static documentation builder with MarkDown.