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.

XnViewMP is a free software to view, organise, convert graphics and photos files or to create slide show, contact sheet, HTML pages.

Pixlr® makes it easy to transform everyday images into stunning works of art. Whether you’re applying a quick fix to your photos or adding your personal touch with effects, overlays, or borders, Pixlr has everything you need to make your moments beautiful.

Pixelmator is a powerful, beautiful, and easy to use image editor. Featuring an elegant and streamlined single-window interface, it puts all the focus on the images you edit, rather than what's around them.

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

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.

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.

From high-precision light and color tools, to advanced clarity and dehaze settings, to the ability to create and save your own filters. Polarr is the ideal photo editor for bloggers, students, and photo professionals alike.

PhotoDemon provides a comprehensive selection of photo editing tools in an 8 MB download. It runs on any Windows machine (XP through Win 10) and does not require installation. It can easily be run from a USB stick or SD card.

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.

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. Effects like Orton, Cross Process, Color Boost, with drag and drop ease.

Enter a world of infinite creativity with the comprehensive photo-editing and graphic design power of PaintShop Pro X8. Accelerate your photo editing with enhanced layers, more precise selection tools, faster brushes and extensive productivity-boosting improvements.

Remini makes old, blurred or low quality photos taken with old cameras or mobile phones to high-definition and clarity.

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.

Pixelitor is a cross-platform raster graphics editor written in Java. It supports image filters, drawing, layers, multiple undo, etc. Currently its main strength lies in the more than 70 image filters and color adjustments, some of which are unique.