Here are the aggregated answers. Feel free to add your CMS here by clicking "edit".
Cascade Server
- Marin County Free Library website
EpiServer
- Malmo University Library (public and internal websites)
Drupal
- Piscataway Public Library intranet
Joomla
- Howard County Library staff intranet
Maia
- Howard County Library homepage
PLONE
- The University of North Texas Libraries public website
TextPattern
- Madison-Jefferson County Public Library main website and new History-Geneology site
WordPress
- Groton Public Library blog
- Howard County Library staff blog
- Multicultural Aged Care Library blog