echo effect

hD is a distortion effect. It can also directly add note harmonics.

M3 Audio Unit is a distortion effect with two wave shapers.

Join Clips - iMovie Effect Plug-in

Slow Motion Smoother - iMovie Effect Plug-in

Poladroid is a fun, free photo effect tool

Extract images, video, sound or text from files and folders.

Stitch photos perfectly, with simple drag-and-drop.