The following is a small list of sites recommending astronomy related apps, to maintain a list of apps here would be an almost impossible task due to the very fast nature in the developement of these apps and the speed in which they become surpassed by new apps.  

http://heavy.com/tech/2014/04/top-best-astronomy-apps-iphone-android-april-2014/

http://www.iphoneness.com/iphone-apps/top-astronomy-applications-for-iphone/

http://www.macobserver.com/tmo/article/12-essential-ios-apps-for-amateur-astronomers

http://www.knowyourapps.com/top-5/star-gazing-apps/

http://www.businessinsider.com/11-best-astronomy-apps-for-amateurs-2013-10?op=1