If you have various Quicktime movies (in MOV or QT format), then you need a tool like Movie Title Maker 1.13, which is an editor that lets you add titles and both visual and sound effects to your Quicktime movies, and save them in AVI or Flash (SWF).
It supports a large variety of effects to apply like different transparency levels, shadow, filters, 3D effects, illumination, deformations and general video retouches.