Tagsdock - Tag Instagram photos instantly from your iOS keyboard.
Twidy App - Tinder for Twitter - Tidy up and declutter your timeline
Hashtagger - Hashtagger is an exciting platform that allows you to generate popular hashtags for Instagram.
Shipstreams - A list of makers shipping live
Friski - Search your Instagram posts
Vanilla Timeline for Twitter - Browse Twitter without the some-user-liked tweet clutter.