Firstly, for easy reference, our "Portals" section is currently listing both Official and Third Party websites associated with Starfinder content.
We are also curating other free official content from Paizo and even free fan-made content in our local "Orbitals" section here.
This also includes videos and even conventions and events on Warhorn.net.
Videos have their own collated section titled "Starfinder Videos" with the clickable icon graphic below:
File Resources have their own collated section titled "Starfinder Files" with the clickable icon graphic below:
To contribute additional fan-made content, just post in our forums and our curators will include it in our official Orbital Lists.
Techno Deity and Justicar Supremo