PanoramaCrop for Instagram - PanoramaCrop for Instagram is a free photography app that allows you to easily splits your wide photos so you can make the most out of the new Instagram’s multi-photo images, created and published by Muffin.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
King Camera - Cam 360 Selfie Camera, King Camera is one of best, a professional selfie camera app that takes beautiful selfies in seconds with effects filters.
GIMP - GIMP is a multiplatform photo manipulation tool.
Cool Gram - $5 a month makes your IG officially cool.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.