I have a universal editor called Access Image.
Pros:- Multiple extensions, including gif, png, bmp, jpg, and more.
- Transparency can be set to any RGB value
- Compare/combine images
- Dock/undock all toolbars
- Not a very big file
- Shareware (free...)
Cons:- Shareware (only for 30 days)
- Takes getting used to (Strange interface)
- Can't animate GIFs
- Can't do everything PSP or photoshop can
I am looking for a better one myself, but this one at least gets the job done. If anyone has a better free editor, let me know.
Click here to download it.