sound effects

AppleScript droplet that acts as a sound inspector.

Visual SlideShow Mac: Make SlideShow with cool effects based on Mootools Script!

Movie transition effects for Quicktime

Here is a set of brushes made for cool debris/explosion effects

Brush set of smoke effects

Batch file converter for images, photos, music, sound, archive files.

Sonogram can analyze sound files.

PlayerPro is a music composer and sound editor.

Webcam Video Effects for Photo Booth & iChat.

MailFX is a notifier which replaces (or complete) the sound warning of Mail OSX.