curl -fsSL https://raw.github.com/supermarin/Alcatraz/master/Scripts/install.sh | shOh, and if you are looking to attend an Apple developer conference, you should definitely consider CocoaConf: the attendee group is primarily developers, attendees and speakers are easy to approach and exchange ideas with, and as they had advertised on CocoaConf's site, the food is good.
I learned about a package manager for Xcode named Alcatraz when I attended CocoaConf in San Jose earlier this year. Extending the functionality of Xcode through plugins has been something I've been looking into for a while and the only plugins I knew about in the wild could only be found through Google searches or on NSHipster.com The tool makes it much easier to find plugins for Xcode. Buuuut, it actually also serves up themes, templates and more, all from a menu available within Xcode. Installation is also simple. Type in a single Terminal command and hooorah, it's installed: