A better way of creating office templates for CiviCRM

How can we find a user-friendly way of creating templates for serial letters and other mass communication? Is it possible to integrate CiviCRM with open-source online applications to facilitate the creation of office templates for our users?

This has been bothering us for some time, because many of our users find it hard to set up and work with templates in HTML format. So we started a proof of concept to check possible options… and we found an answer!