BitMappery is described as 'Photoshop in the browser?' and is an website in the Photos & Graphics category. There are more than 50 alternatives to BitMappery, not only websites but also apps for a variety of platforms, including Windows, Mac, iPhone and Linux. The best alternative is GIMP, which is both free and Open Source. Other great sites and apps similar to BitMappery are Krita (Free, Open Source), Adobe Photoshop (Paid), Paint.NET (Free Personal) and Affinity Photo (Paid).
Krita is a professional Free and open source (FOSS) painting program. It is made by artists that want to see affordable art tools for everyone withith concept art, texture and matte painters, illustrations and comics.
MyPaint is a fast painting program with an emphasis on full-screen use. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.
Pixlr® makes it easy to transform everyday images into stunning works of art. Whether you’re applying a quick fix to your photos or adding your personal touch with effects, overlays, or borders, Pixlr has everything you need to make your moments beautiful.