Paint.NET is described as 'Free image editor for Windows, offering layer support, plugins, special effects, and portable use without installation. Lightweight and ad-free' and is a leading digital painting tool in the photos & graphics category. There are more than 100 alternatives to Paint.NET for a variety of platforms, including Windows, Mac, Web-based, Linux and iPhone apps. The best Paint.NET alternative is Pinta, which is both free and Open Source. Other great apps like Paint.NET are Krita, GIMP, Adobe Photoshop and Pixelmator.