Little Photo was developed by moment and it's a great photo editing app. It has more than 70+ effects and filters and with each update there are promises of more filters and effects. This app is free and currently available only for android versions. Users can play around with multiple filters, layering, stacking, to get desired effects to the photos. Users can apply half filters or full filters to get desired results. Little Photo is an easy interface to use and it's quite user friendly too.
You can download the free android version here:
Here is the review for the Little Photo:
25 Best Photo Editing and Retouching works around the world