DropVox
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Requires Mac OS 10.7+

DropVox is a minimalistic audio recorder for Mac OS X. Click the red button to start recording. Double-click to pause or single-click to stop and have the recording saved to a pre-determined folder in MP3 format.

Also check out DropVox for iOS which uploads recordings automatically to Dropbox.

Current build expires around February 6th, 2015

KeyUp
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Requires Mac OS 10.6+

KeyUp is a beautiful on-screen keyboard with a few built-in theme and sound choices. Enjoy a clacky, mechanical keyboard or an old-fashion typewriter sound.

Known Limitations: Currently only supports US keyboard layout.

Current build expires around April 16, 2015

Tuck
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Requires Mac OS 10.5+

Tuck allows you to quickly and simply clear multi-window clutter by hiding windows under your screen edges. Choose a window, use Tuck to designate which screen edge you wish to dock it to, and the window slides under that screen edge, out of sight. Mouse over to that screen edge and a tucked window will slide out until you move your cursor outside the window.

Current build expires around April 16, 2015

PixelPeeper
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Requires Mac OS 10.5+

PixelPeeper allows you to watch a pixel on your screen and execute an AppleScript when it sees that pixel change.

This can be used to alert you when a long operation is complete. For example, you can watch a pixel within the progress bar/window when performing a software update or installation, downloading or copying large files, or backing up your system. There are literally hundreds of other uses – please let us know how you put PixelPeeper to work watching your desktop.

FinderMinder
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Requires Mac OS 10.5+

FinderMinder allows you to specify where (position) and what size you want newly opened Finder windows to appear. The default Finder behavior is to remember the last position and size for every window, but this can be frustrating if you already know where you want every window to appear (for example, centered at 800x600). FinderMinder must be running for window reposition and resize to take place.

FinderMinder must continue running in the background for window reposition and resize to take place, so click the "Hide" button to dismiss the preferences and keep FinderMinder running. Simply re-launch FinderMinder to access the preferences again or to quit the app.

PowerBlock
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Requires Mac OS 10.5 to 10.8

PowerBlock intercepts and ignores presses of the power button and optionally runs an AppleScript. This is handy on the MacBook Air where the power button is now a key on the keyboard and can be accidentally pressed.

By running an AppleScript when the power button is pressed, you can setup your system to immediately shutdown, restart, sleep, or eject a DVD when the power button is pressed. This is great for headless servers.

Known Limitations: PowerBlock is NOT compatible with OS X 10.9 Mavericks due to changes in the power system. PowerBlock does NOT prevent a hard shutdown if you hold the power button for more than 4 seconds. Not compatible with Macmini1,1

ShadowSweeper
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Requires Mac OS 10.5+

ShadowSweeper turns shadows for windows and menus off or on, bringing a simple, clean, flat look to your screen. Just launch ShadowSweeper to disable shadows, and launch again to bring them back. ShadowSweeper is great when placing windows side by side seamlessly, with no shadow overlap.

Known Limitations: The shadow under the menu bar is still present.