You are probably looking for the current homepage of the Open Infrastructure Architecture repository (OIAr); you can find it by clicking here.
Note: the original OIAr that was live from 2012 through 2014 has been archived, but can still be accessed
for reference purposes.
If you're interested in the latest development, keep a lookout for the development repository
(currently inactive while the production OIAr is improved).
(c) Architecting.nl 2015