sound similar

Sound recorder.

Sound effects playback for Mac OS X.

Sound activated virtual Santa screensaver.

Find, sort, and eliminate similar photos.

Cloud storage and file syncing service, similar to Dropbox; free 15GB account.

Get rid of duplicate and similar photos automatically.

Merge similar Excel file type documents.

Tiling window manager similar to xmonad.

Drawing app, capabilities similar to Illustrator/Freehand/CorelDraw.

Rapid engineering and scientific prototyping, similar to MATLAB.