iPaintX

iPaintX is a user-friendly paint program, reminiscent of Microsoft Paint and Apple’s own now-defunct MacPaint.

It provides users with a means to make simple images quickly.
Features:
- iPaintX can open and save to most major image formats, including BMP, PNG, JPEG, TIFF, and GIF.
- Full support for transparency is available for image formats that support an alpha channel.
- You can also paste images copied from many common Mac applications, including Microsoft Office and Apple iWork.