Last Wednesday I launched gitTio, a search engine that indexes all Titanium modules and Alloy widgets found on GitHub.
gittio install -g in your project and it will install all missing modules and widgets required by your
Of course there is much more you can do, like installing or uninstalling a specific component, version or even for a specific platform, updating installed components etc. The CLI page on the gitTio website tells you all about it.
To get the gitTio CLI use NPM:
sudo npm install -g gittio
I recorded a simple screencast showing how the gitTio CLI works: