Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Adobe Photoshop Lightroom CC - Adobe Photoshop Lightroom CC is a commercial photo processor and image organizer.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
GIMP - GIMP is a multiplatform photo manipulation tool.
Hugin - Hugin is an easy to use cross-platform panoramic imaging toolchain based on Panorama Tools.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!