Acorn - http://www.flyingmeat.com/acorn/

Pixelmator - http://www.pixelmator.com/

Photoshop Elements - http://www.adobe.com/products/photoshop-elements.html

Analog - http://www.realmacsoftware.com/analog/

Plastic Bullet - http://www.redgiantsoftware.com/products/all/plasticbulletosx/

Snapheal - http://www.macphun.com/snapheal

FX Photo Studio - http://itunes.apple.com/us/app/fx-photo-studio/id433017759?mt=12

Flare - http://flareapp.com/

CameraBag 2 - http://nevercenter.com/camerabag/desktop/

Snapseed - http://www.snapseed.com/home/desktop/features/

HDRtist - http://www.ohanaware.com/hdrtist/

PicFrame - http://activedevelopment.co.nz/picframe-for-mac/