 <p>Xcode can display man pages:</p> <p><a href="http://developer.apple.com/DOCUMENTATION/DeveloperTools/Conceptual/XcodeWorkspace/200-Documentation_Access/chapter_6_section_8.html" rel="nofollow noreferrer">http://developer.apple.com/DOCUMENTATION/DeveloperTools/Conceptual/XcodeWorkspace/200-Documentation_Access/chapter_6_section_8.html</a></p> <p>For this to work, the "Core Library" doc set or "All Doc Sets" must be selected.</p>