Sphinx - Python Documentation Generator

Sphinx is a tool that makes it easy to create intelligent and beautiful documentation for Python. It also supports C and C++. The support for other languages is in the plan. Support for multiple output formats are supported.

• Output formats: HTML (including Windows HTML Help), LaTeX (for printable PDF versions), manual pages, plain text
• Extensive cross-references: semantic markup and automatic links for functions, classes, citations, glossary terms and similar pieces of information
• Hierarchical structure: easy definition of a document tree, with automatic links to siblings, parents and children
• Automatic indices: general index as well as a module index
• Code handling: automatic highlighting using the Pygments highlighter
• Extensions: automatic testing of code snippets, inclusion of docstrings from Python modules (API docs), and more

Check out the list of sites using this product http://sphinx.pocoo.org/examples.html