Apps with 'Retouch photos' feature

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.

Comprehensive photo management software for viewing, batch converting, editing and resizing images and creating thumbnail sheets.

Pixelmator is a image editing application for macOS and iOS.

PhotoScape is a fun and easy photo editing software that enables you to fix and enhance photos.Key Features:

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

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.

Snapseed is a photo enhancement and sharing app with a powerful suite of imaging filters and tools for anyone, anywhere to transform any image into an extraordinary photo.

Fotor is a online picture editor and graphic designer, allowing you to use online photo editing tools, such as add filters, frames, text, stickers and effects…and apply design tools to make creative photo designs and graphics.

PaintShop Pro is a photo editor with additional organizing capabilities, including keyword tags, auto sorting and facial recognition.

PicMonkey is a feature-rich online photo editor that works right in your browser; no downloads necessary. Touch-up tools like Teeth Whiten, Blemish Fix, Weight Loss.

Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.

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.

Pixelitor is a cross-platform raster graphics editor written in Java. It supports image filters, drawing, layers, multiple undo, etc.

Photoline is a professional image editor which offers creatives a mostly non-destructive workflow for 8/16/32bpc image processing and compositing in RGB, CMYK, and Lab modes.

Full vector editing, DTP features, and a HSV/HIS workflow are supported. .

PixaFlux is a node based image processing application.