digiKam - Professional Photo Management with the Power of Open Source
Shifty - More control over macOS Night Shift
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Form 2 - The most advanced desktop 3d printer ever created
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
BLOCS - Visual web design app.