  In recent years eXtended Reality (XR) technologies have matured and have
become affordable, yet creating XR experiences for training and learning in
many cases is still a time-consuming and costly process, hindering widespread
adoption. One factor driving effort is that content and features commonly
required by many applications get re-implemented for each experience, instead
of sharing and reusing these resources by means of a common platform. In this
paper we present two XR experiences in the context of informal learning and
first responder training along with the shared platform they have been created
with and the creation process. Furthermore, we have technically evaluated
relevant parts of the platform for feasibility of use with experience
requirements and confirmed applicability. Finally, we present an informal
expert evaluation of the content creation process's user experience for the
informal learning experience along with guidelines derived from the findings.
