I helped build the Hillcrest Animal Hospital Intranet, which both the management & vets use on a daily basis to do their job. The Intranet is one of my largest projects to date which allows the management to manage clients, animals, prescriptions, documents and much much more. It was built on Ruby on Rails 3 (which will be upgraded to 5 soon).
Many external services are also used for much of the functionality throughout the Intranet. Emails are sent through http://deliverhq.com and there is also a text messaging system built with http://twilio.com. Some areas of the Intranet are updated in real time using http://pusher.com