An FFGL effect that puts a pond over your clip: drop a pebble, skim a stone or let it rain, and the water follows the water-wave equations to the letter. The still disc inside the ring, the long waves racing ahead, the caustic net on the bed and the sun's glints all come out of the physics rather than being drawn.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.