It makes no sense to build a huge page of links when a simple few will give you access to everything out there. These are the ones I thnk are most critical.

This link will take you to their home page with plenty of additional links.

Their links page is massive and they also have an on-line rotorcraft directory that highlights all available gyros and helicopters.

This is the first and still the only site dedicated to ultralight gyroplanes.