Picture.io - Klout score for Instagram. See how insta famous you are. 📷✨
Roundio - Explore what people posted to Instagram or Flickr near you
Stock Against Photography - A game we made with pictures we didn’t take.
Instaround - A simple app to find Instagram photos and people around you.
Instabattle - May the best Instagrammer win!
PicSlam - Instagram photo game that quizzes you on friends' pictures