Choice is good, so here are some other documentation tools that you can try:

Non-commercial tools

• appledoc
• AutoDOC
• Autoduck
• CcDoc
• Cxref
• cxxwrap
• Doc++
• DoxyS (Doxygen fork/spinoff)
• Epydoc
• gtk-doc
• HappyDoc
• HeaderDoc
• HTMLgen
• HyperSQL
• Javadoc
• jsdoc
• Natural Docs
• phpDocumentor
• PHPDoc
• RoboDoc
• ScanDoc
• Synopsis
• TomDoc
• Tydoc

• VBDOX

Commercial tools

• Help Generator
• Doc-o-matic
• Together
• Document X

Seen enough? Then let's go back to Doxygen.