"Bricolage is a full-featured, open-source, enterprise-class content management system. Written entirely in Perl and using Mason to drive the UI, it offers a browser-based interface for ease-of use, a full-fledged, Mason-based templating system for flexibility, and many other features. It operates in an Apache/mod_perl environment, and uses the PostgreSQL RDBMS for its repository."

Mason Powered Apps mentions bricolage and lots of other open source apps packages that run on mason.

Bricolage is mentioned in perlmonks at "The Register" and eval "use Bricolage";.

See also my Survey of Surveys on HTML Templating systems for FMTYEWTK.