I've been using Swagger Codegen for the past few months, working on client SDKs in Ruby, Python, Java, and JavaScript.
The biggest thing that impressed me was how active the community was. My pull requests were responded quickly, probably fastest compared to other open source projects I contributed to in the past.
"... in a world that combines science fiction (advanced gadgets) and fantasy (magic, swords), whereas the western world keeps the two entirely separate."
I might as well take the opportunity to point out that there's a new Shadowrun title (from last year) that's being continually updated and features a complete map/campaign editor for anyone to use.
The biggest thing that impressed me was how active the community was. My pull requests were responded quickly, probably fastest compared to other open source projects I contributed to in the past.