iTunes Agent has been renamed to Notpod, and has moved from https://ita.sourceforge.net to https://www.notpod.com. Notpod offers the same well known user interface, and the only change is that it will no longer present itself as iTunes Agent, but rather Notpod.

iTunes is a great music player and organizer. Unfortunately iTunes is made to only synchronize with iPods. Not everyone owns an iPod, though Apple certainly would have loved that. How great would it not be if you could synchronize your non-iPod MP3 player, your Playstation Portable and your Walkman phone with your iTunes Library? Enter: Notpod! Read more.