IrfanView - IrfanView ... one of the most popular viewers worldwide.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Adobe Animate - Adobe Animate is a Flash, vector animation software.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Synfig Studio - Just another WordPress site