Animated sprite editor & pixel art tool.
A multi-platform painting and photo manipulation program, similar to Adobe Photoshop.
Cosmigo Pro Motion
Drawing and animation software for Windows designed similar to Amiga Deluxe Paint.
GIMP isn't the first thing people will think of when you say Pixel Editor, but if you set it up nicely you can get some really cool things working for you in it. As you can s...
Pixel Art Pro
Pixel art/sprite animation tool for iPhone/iPad
Browser-based, HTML5 pixel art editor, with Wacom tablet support (requires a plugin, which has limited browser+OS support) and collaboration features.
Instapix: Pixel Art Editor
An easy pixel art editor for Android.
Paint Shop Pro
Especially the older versions of PSP (7,8... while it still was made by Jasc) were great for pixel art editing.
Free, Open Source, Java based pixel editor