Ruby on Rails
RealWorldUsage

As this page and its popularity have grown, it has exceeded the apparent 50 KB page limit of this wiki. Therefore it has been split into two pages:

Because this went unnoticed for a long time, some entries unfortunately rolled off the end of the list (somewhere in the middle of the T’s). These are in the slow process of being recovered from previous revisions of this page.

Other sites worth mentioning:

Top 100 Rails sites open to the public to keep it up to date