I use Snapseed on Android. It's a practical app with many photo editing tools
I like how I can edit my photos here,
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Friski - Search your Instagram posts
PicsArt - Explore 100,000,000+ awesome images and photos on the web
Tagsdock - Tag Instagram photos instantly from your iOS keyboard.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Metaplug - Search engine for Instagram