RiteTag - No idea which hashtags to use? Get instant hashtag suggestions for images and texts on desktop and mobile.
Hashtag Suggestions for Instagram - Find the best hashtags for every photo
Tagsdock - Tag Instagram photos instantly from your iOS keyboard.
Jetpack App - The fastest way to copy your hashtags for Instagram
IQta.gs - Hashtag suggestions for Instagram
Urlooker - Urlooker is a service for monitoring web pages.