GIMP delivers powerful functionalities for photo retouching, image composition, and format conversion. As a versatile tool, it serves as both a simple paint program and a high-end retouching suite, and offers batch processing for mass image tasks in an accessible open-source platform.

Comprehensive raster graphics editor offering advanced photo and image editing features. Supports multiple layers, masks, alpha compositing, various color models, and has limited vector graphics, 3D, and video capabilities. Extensible via plug-ins.

Paint.net is a free and very capable image editing software for Windows. Great alternative to Photoshop for people that do not need all the stuff PS offers.

This vector graphics editor offers sophisticated tools for drawing, typography, and color management. Equipped with powerful features like multiple art boards, Blob Brush for vector painting, and transparency in gradients, it supports designs for print, web, interactive, motion, and mobile platforms.

MyPaint is a fast, distraction-free, and easy painting tool for digital artists. It supports graphics tablets made by Wacom, and many similar devices.

Procreate is a versatile, award-winning app for creative digital drawing and painting on iOS. It delivers a robust, professional toolset with hundreds of configurable brushes, a powerful layering system, vector graphic tools, and comprehensive design capabilities, ensuring desktop-level flexibility and power.

Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included with almost all versions of Microsoft Windows. It opens and saves files as Windows bitmap (24-bit, 256 color, 16 color, and monochrome, all with the .

From advanced image filters to professional local adjustments, Polarr Photo Editor is the most versatile and powerful online photo editor in the web.

Corel's tool provides comprehensive photo editing and design features including enhanced layers, precise tools, RAW editing, and organization capabilities such as keyword tags, auto sorting, and facial recognition, making it ideal for both novices and professionals in various projects.

PhotoFiltre 7 is a complete image retouching program. It allows you to do simple or advanced adjustments to an image and apply a vast range of filters on it. It is simple and intuitive to use, and has an easy learning curve.

Glimpse is an open source image editor based on the GNU Image Manipulation Program. The goal is to experiment with new ideas and expand the use of free software.

Seashore is an open source image editor for Mac OS. It features gradients, textures and anti-aliasing for both text and brush strokes. It supports multiple layers and alpha channel editing. It is based around the GIMPs technology and uses the same native file format.