GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
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.
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 .
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.Discontinued
The Glimpse editor has been discontinuedSource: https://glimpse-editor.org/posts/a-project-on-hiatus/
KolourPaint is a simple painting program to quickly create raster images. It is useful as a touch-up tool and for simple image editing tasks.
DrawPad Graphic Design and Drawing software is an easy-to-use image composition and manipulation program, an essential tool for all types of graphic design projects. Easily draw and create graphic images.
XGimp is an adaptation for iPhone and iPad of the app GIMP (GNU Image Manipulation), which is a freely distributed program for tasks as photo retouching, image composition and image authoringThis app doesn't have any features at the moment.
Blazing fast Free online image editor tool to adjust brightness, contrast, hue, saturation, gamma etc. Drop your image in tool and start editing using image filter controls. No signup and no restriction to use this tool.This app doesn't have any features at the moment.
Everyday drawing There are hundreds of painting and drawing apps on the App Store. This one is a bit different. It doesn’t want to grow up to be Photoshop, Illustrator, or Draw Anything the Next Generation. It’s not intended for professional artists.This app doesn't have any features at the moment.