Demo theme addon for osclass ehance your classifieds with feature to change front office theme on the fly.
Plugin is not suitable for standard production classifieds website, it is targeted more-less to theme developers. Instead of creating 1 osclass installation for every theme, plugin enable to use just 1 installation and let customers switch to theme they are looking for.
When selling themes, using one osclass installation instead of many may greatly reduce time required for maintenance as well as space required on hosting.