Top Social Media Content AppsAIRR MEDIA
Agro Pulsehttp://www.agorapulse.com/
WOO Boxhttp://woobox.com/
WishPondhttps://www.wishpond.com/
Easy Promoshttp://www.easypromosapp.com/
ShortStackhttp://www.shortstack.com/
Social Candyhttp://new.social-candy.com/
Referece
http://brandswithfansblog.fandommarketing.com/top-ten-apps-for-social-media-contests/
http://www.guavabox.com/blog/top-apps-for-managing-your-facebook-contest-2