John's new site is here https://www.ragingtrifle.com/jn/
Cthulhu Rising core book is available as a monograph (https://www.amazon.com/Cthulhu-Rising-Roleplaying-Century-monograph/dp/1568822634) with its sourcebook called Jovian Nightmares (https://www.amazon.com/Jovian-Nightmares-John-Ossoway/dp/1568822952/)
Fan base stuff for CR can be found here https://gitlab.com/NHcthulhu/NewHorizon
John has written a new SciFi rpg fully compatible with the BRP system https://openquestrpg.com/river-of-heaven/
M-Space is also compatible with the BRP system https://www.frostbytebooks.com/m-space