Countdown is a Mac OS X utility application that allows the user to pick from a set of pre-defined actions to execute when the timer reaches zero.
You can find some screenshots in the Wiki.

• Millisecond accuracy
• Seven pre-defined actions:
  1. Shut Down
  2. Restart
  3. Sleep
  4. Log Out
  5. Display dialog with custom text
  6. Beep and display dialog with custom text
  7. Execute custom shell script

• Mac OS X 10.6 only for now.
• Currently the execute shell script action does not feature running a shell script from a saved file and therefore is rather limited.
• May not be in the best suited application form right now. Three possibilities for a different approach:
  1. Make Countdown a multi document app to be able to run multiple countdowns at the same time.
  2. Countdown as a menu extra that is visible from the global menu bar could also make sense.
  3. Implement Countdown as a HUD based panel that is always visible (Although I am not too big a fan of this approach).

Application icon (hourglass.icns) from CocoaDialog, © 2004 Mark A. Stratman.

Created by André Berg on 2010-03-21.
Copyright Berg Media 2010. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.