GIMP - GIMP is a multiplatform photo manipulation tool.
Flickr - image and video hosting website
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
LayAuto - Automated window management for Mac ✨