Yasu — short for "Yet another system utility" — is an Apple OS X maintenance utility developed to do a certain group of tasks quickly with just a few clicks, instead of typing a bunch of complex commands in the Terminal application.
With the release of Mavericks, I made the decision to suspend Yasu development for a while. Since I wasn't giving it much attention, I decided to make the app free again. Use this "email" and code to register the app. Support is not included without a donation. Donations are gratefully accepted.
If you haven't upgraded beyond OS X 10.4 yet, you can download a version of Yasu that works on those earlier systems here.