Apple has just released its latest iteration of OS X, with features including improved performance, natural language search in Spotlight, Split View in full screen mode & a new Safari Web browser with pinned tabs. El Capitan is available as a free download.
Appleinsider
http://appleinsider.com/articles/15/09/30/apple-releases-os-x-1011-el-capitan-with-safari-9-new-spotlight-search-split-view-more
Lifehacker
http://www.lifehacker.com.au/2015/10/top-secret-features-in-os-x-el-capitan/
ExtremeTech
http://www.extremetech.com/computing/215243-the-best-new-features-in-os-x-10-11-el-capitan
Macworld
http://www.macworld.co.uk/feature/mac-software/os-x-el-capitan-best-new-features-video-3616306/ / Apple on Wednesday released public OS X 10.11 El Capitan enhancements features Safari Spotlight ramping up Macintosh performance Spotlight search files content natural language information weather stocks public transit schedules system-wide features Split View fullscreen full screen mode streamlined Mission Control upgrades Chinese Japanese language support new fonts better keyboard trackpad input Safari pinned tabs Web video AirPlay muting tabs Smart Search field Apple Maps search public transit info transport push directions iPhone Google Maps Mail iOS swipe gestures marking deleting items quickly add contacts Calendar events message content new Notes app checklists attaching photos videos URLs map locations application app share webpage note Safari Photos app improved support third-party editing extensions options sorting albums tagging faces locations games graphics-intensive apps run faster Apple's Metal technology speedier performance improvements app launch task switching PDF viewing El Capitan upgrade free download available Mac App Store Safari 9 OS X Yosemite version /