The Aviary Android app behaves in an unusual way — it doesn’t show up on your list of apps. Instead, you open it by firing up the Gallery app (or any other photo app), finding a picture you want to edit, an then “sharing” it with Aviary Editor.
Once you do that you can apply a number of digital effects, crop, resize, or adjust colors, or make other changes. Out of the box, Aviary includes a decent number of basic tools — but you can also buy additional effects through in-app purchases.
Aviary is available for Android 2.2 and up.
via Android Police