Mac OS X Softwares to Layer Support

GIMP (GNU Image Manipulation Program) is a powerful, free, and open-source raster graphics editor used for image manipulation, retouching, composition, and authoring. It supports a vast array of file formats and provides sophisticated tools comparable to commercial alternatives, making it a versatile choice for photographers, designers, and artists.

DrawPile is a free and open-source collaborative drawing program that allows multiple users to sketch simultaneously on a shared canvas in real time, perfect for brainstorming, creating comics, or just having fun drawing together online.

Mischief is a digital sketching, drawing, and painting software designed for Windows and macOS, renowned for its infinite canvas, offering boundless creative space without resolution limitations. It provides a focused and fluid drawing experience, ideal for artists seeking a distraction-free environment to explore ideas.

ArtRage is a powerful, realistic bitmap graphics editor designed for digital painting and drawing. It offers a wide range of natural-media tools that mimic traditional art mediums like oils, watercolors, and pencils, with features like paint mixing and texture simulation. It's suitable for artists of all levels, from beginners to professionals.

GIMPshop was a discontinued modification of the free and open-source GIMP image editor, designed to provide a user interface and workflow closer to Adobe Photoshop for users transitioning between the two programs. It aimed to reduce the learning curve for Photoshop users exploring open-source alternatives.

Dia is a free and open-source diagramming software suitable for creating a variety of diagrams including flowcharts, UML diagrams, and network layouts.