NeoPaint

NeoPaint is a painting application which comes packed with several powerful and easy-to-use tools. It can be handled by users of any level of experience.
The app is packed in a clean and familiar interface where you can use some basic painting tools, such as pencil, paint brush, standard fill, clone, stamp pad, line, rectangle, text and eraser.
But you can also flip, rotate, resize and duplicate pictures, create texture and make some image adjustments (e.g. brightness, contrast, curves, color channels).
Additionally, you can create and duplicate layers, zoom in and out, switch to full screen mode, display a grid and rulers, as well as apply various effects - traditional (e.g. anti-alias, blur), paper textures (e.g. brick, fire), artistic (e.g. cartoon, pencil), borders (e.g. bevel, buttonize), colors (e.g. darken, high pass) and fancy (e.g. bump map, lattice).
Furthermore, you can take snapshots (e.g. full screen, active window, selected object, webpage), view picture information and export items to the PDF format, among others. From the 'Preferences' screen, you can configure settings regarding startup, brush cursors, saving mode and backups, undo and plug-ins.
The image editing program requires a moderate amount of system resources, has a good response time and contains user's guide. We have not come across any issues during our testing; NeoPaint did not freeze, crash or pop up error dialogs. First-time users may need some time to get accustomed to NeoPaint's features.