Cyclone author here. R7RS libraries and SRFI's will help to some extent, for example hashtable support was more or less plug and play. As Cyclone matures it could potentially support R7RS-large which is going to include quite a bit. But we'll have to see how much of that can handle "real" things like database, graphics, etc.
It would require major changes to the CHICKEN runtime to support native threads, but Cyclone does map out a potential solution.
http://justinethier.github.io/cyclone/docs/api/srfi/69
Admittedly this does not include examples.
Perhaps it needs to be more clear that the API documentation contains links both to our internal docs as well as the official SRFI pages:
http://justinethier.github.io/cyclone/docs/API#srfi-librarie...