Alder Metric
I'm Gustavs, the person behind Alder Metric. I make tools for things like animating PNG artwork, sorting photos, and other jobs that get more fiddly than they should.
I share demos and walkthroughs on YouTube so you can see what each app does before deciding whether it's useful to you.
YouTube:
Build pixel cars from five templates. Customize parts, proportions and colors, then export four matching views.
Turn images into contour drawings. Keep selected detail and export SVG.
Add looping motion to PNG game art and export a sprite sheet.