The last generally release version of a smartphone OS released (almost entirely) by Nokia before they sold their soul to Windows. Also, the first smartphone OS, by far. Also, for a long, long time and years after iOS the most popular smartphone OS by far. 

== UI Guidelines: ==
 * [[http://library.forum.nokia.com/index.jsp?topic=/Design_and_User_Experience_Library/GUID-A8DF3EB8-E97C-4DA0-95F6-F464ECC995BC_cover.html|Nokia Design & User Experience Library]]
 * [[http://harmattan-dev.nokia.com/docs/ux/pages/pattern_library.html|Nokia N9 UX Guidelines]] from Nokia. Seems to be oriented to developers, and none of the tools are re-usable templates, but lots of design examples. Check the other tabs as well.
 * [[http://wiki.forum.nokia.com/index.php/Category:Mobile_Design_Patterns|Nokia Mobile Design Patterns]] A series of articles, approaching a pattern library. Note that some of these may be very familiar, as it is a wiki, so some older patterns from this book and other information posted to the wiki have been copied to here by the authors, and other users.
 * [[http://www.forum.nokia.com/Design/|Forum Nokia Design Portal]] PDF.
 * [[http://developer.symbian.org/wiki/User_Interface|Symbian UI Wiki]]
 * [[http://www.forum.nokia.com/info/sw.nokia.com/id/73e935fe-8b59-43b2-ab3e-1c5f763672db/Series_40_UI_Style_Guide.html|Nokia Series 40 UI Style Guide]]
 * [[http://www.forum.nokia.com/info/sw.nokia.com/id/34762388-9434-4c42-9c5e-3e545b0975ea/S60_Platform_Visualization_and_Graphic_Design_Guideline_v1_0_en.pdf.html|S60 Visualization and Graphic Design Guideline]] PDF.
 * [[http://www.forum.nokia.com/info/sw.nokia.com/id/5c419b14-75ff-4791-b1a8-db1e0d72e36e/Symbian_3_UI_Style_Guide.html|Symbian^3 UI Style Guidelines]] PDF.
 * [[http://www.slideshare.net/nokia-developer/series-40-full-touch-ui-style-guide-part-1|Nokia Asha UI Guidelines]] An intro to the Asha UI... but I am pretty sure that this ended up being just "Touch and Type" S40, so the Asha name is not important for UI design/development now. 

== Stencils & Templates: ==
 * [[http://www.forum.nokia.com/Develop/Web/Mobile_web_browsing/Web_templates/Templates_for_smartphones/|Templates for smartphones]] meaning S60 3rd and 5th edition, Symbian ^3, Maemo and some newer S40 devices.
 * [[http://www.forum.nokia.com/info/sw.nokia.com/id/cfc7b6a4-2dc5-4c91-88a5-c35764fff8fe/S60_Wireframing_Stencils.html|S60 Wireframing Stencils]] S60 (through 5th edition) elements of all sorts. (Illustrator, Fireworks)
 * [[http://www.forum.nokia.com/Develop/Web/Mobile_web_browsing/Web_templates/Templates_for_mobile_phones/|Templates for mobile phones]] meaning mostly S40 featurephones, but also some older S60 devices.