showFoto - ShowFoto is the standalone image editor of the digiKam project.
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
PixBuilder - Free Photo Editing Software for PC
APK Pure - Download apk for Android with APKPure APK downloader. NoAds, Faster apk downloads and apk file update speed. Best of all, it's free
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
APKMirror - Android Market and APK Downloads