Instaround - A simple app to find Instagram photos and people around you.
VerifyShare - instagram, instagram tools, giveaway, parsing,
Roundio - Explore what people posted to Instagram or Flickr near you
Giv - Snapchat & Instagram giveaways made easy
Herefeed - See what's hot near you. Powered by Instagram.
Retweet Pick - Retweet Pick is a random name generator for Twitter giveaways via generating a winning name from the list.