The Desktop Cat Cursor (not free but really cheap) , from Samperson, turns your computer's pointer into a big cat's paw extending onto the screen. Currently only for Windows 10 and 11 but a Mac version is in the works.

YO DAWG KAT, I HEARD YOU LIKE.... You could pair the Desktop Cat Cursor with this update of the classic desktop toy Neko for extra kitty fun. This rewrite requires ability to compile Go (I got it working pretty easily), but should work on most desktop platforms. It doesn't expose a UI so you'll have to do an end-task to close it. (If you start it from a command line, you could halt it with Ctrl-C.)

Waluigi sings "Rainbow Connection." It'll consume two minutes and 44 seconds of your day, but no more than that. That's all. That's enough.

From Matthew Taranto, who made the Brawl in the Family webcomic some years back.