Do you have recommendations for any generic tools that can do this for images, artwork, web pages, etc., and allow one to easily view the evolution like a photographer would look at photos captured in an app like Adobe Lightroom or similar? Preferably something that allows annotations and version control so each change is clearer? It'd be great if there are some free tools too. I work on UI very rarely, if at all, but I see value in a workflow like this.