A small collection for the Mac. Nap installs them, keeps them current, and stays out of the way.
Each one does a single thing properly, with a handful of controls and nothing else.
Flip Clock
The cards travel in a straight line and bounce off all four edges, the way the old DVD logo did. Every digit turns over in two stages, the same as a real split-flap board: the front face falls to the seam, then the new one swings up out of it.
Football
Twelve pentagons and twenty hexagons, tumbling as it travels. It leaves the slingshot small and fast, bounces off every edge, and grows as it slowly runs out of energy. When it finally stops, the slingshot appears wherever it landed, draws it back, and sends it off somewhere new.
More are on the way. The list stays short on purpose — each one has to be worth leaving on.
Drag it to Applications and open it once. It installs the screensavers for you, and shows whether they're installed and selected.
Press Open Screen Saver Settings and Nap takes you straight to the right pane.
macOS files third-party screensavers under Others. If you don't see them, press Show All.
It starts when your Mac goes idle, and runs until you touch the mouse or keyboard.
Nap shows the real screensaver while you adjust it, so you can see what you're choosing. No photo import, no custom backgrounds, no palette editor.
Changes apply the next time the screensaver starts.