For a few years now we've been working on a project we have named Portfolio Architectures. These are based on selecting a specific use case we are seeing used in the real world by customers and then finding implementations of that case using three or more products from the Red Hat portfolio.
This basic premise is used as the foundation, but many aspects of open source are included in both the process and the final product we have defined. There is a community, where we share the initial project kickoff with a group of architects and use their initial feedback from the start. We also present the architecture product we've created right at the end before we publish to ensure usability by architects in the field. The final published product includes some internal-only content around the customer projects researched, but most of the content is open and freely available through various open-source channels.