GAptI is currently a simple utility to handle a .apt file as defined by ThirdPartyApt. The idea is simple. It pops up a dialog asking if the user is sure he wants to install the software, then prompts for crediantials to fulfill it. A source is added to apt/sources.list to track future updates. Currently it lives at http://akita.larvalstage.net/~wasabi/bzr/gapti--main. Included in universe since 2006, april 26.