PhotoFlare - Quick, simple but powerful Cross Platform image editor.
PixaMotion - Make live photos, live wallpapers, moving Backgrounds & themes with animation effects.
showFoto - ShowFoto is the standalone image editor of the digiKam project.
StoryZ - StoryZ Photo Motion and Video Maker is a photography app that allows you to create visual stories from still images.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
VIMAGE - Add moving effects and elements to your photos.