you can build your own personal server, see the App Inventor sources here
http://appinventor.mit.edu/appinventor-sources
alternatively use one of the available personal servers
There is the offline version of AiLiveComplete and AI2U, both are a 1:1 copy of the MIT version without additional features. The main advantage is, that you do not need internet connection and you can build larger projects (> 5 MB). The disadvantage is, it takes time for the guys to build a new version, so the offline version is not always identical with the current MIT version. Therefore if you use one of these personal server, make sure, you use the most recent one, this will be the version most similar to the current MIT version.
in case of questions, please ask in the
Ai2U forum
Taifun