AppFresh is an utility that keeps all applications on your Mac up to date by checking the internet for new releases and makes downloading and installing them a breeze.
AppFresh covers software updates from Apple and third parties and can be used as a replacement for Apple's own Software Update application to provide one central place to make sure you're up to date.
AppFresh is still very much work in progress, and this is only a preview for now. For safety reasons, it won't overwrite your applications but extract downloaded updates to your desktop. Make sure to check the development blog regularly. You are welcome to leave your feedback or suggestions for improvements there.