Depending on your skill level, interest in learning, and cron and PHP access on your server, you can do it yourself in a script.
This loop of a StrikeStarUS radar image is done with a script I wrote.
And my sig image is a combination of scripts. One controls and grabs images from a PTZ camera, and stitches them. Another crops and creates the loop.
I don't usually distribute my scripts, because I'm a hack PHP programmer and don't have the patience to make the scripts more user friendly and fully document them.
BTW, taking apart other scripts and learning from them is how I got enough experience to create these. There are probably still echoes of Anole's weather sticker script buried in them. Over the years I learned to overlay text from Anole, and then figured out how to crop and overlay parts of images, select text colors based on the background, stitch panoramas, do the animations, and probably more. A lot of it, like the panorama stitching, was hand-tuned for a particular camera and its presets.