Eye of the Cyborg

This is a very action-packed novel with both thrills and romance. Joshua Cain is a futuristic warrior and explorer with his human genetics enhanced by some unknown alien life forms. He's badly injured during a space battle, and an unknown species saves his life by implanting him with unknown robotics. His cyborg eye contains a strange intelligence that can take control over most modern computers and electronics.
The eye is programmed with Intel on how to stop a new race of savage space explorers coming into the human occupied systems.  The Rondors and Titans are two highly advanced species that greatly resemble highly evolved bears and rhinos. These aliens are being guided by an alien entity of energy that claims to be their god of war and is gifting them with weapons technology far beyond human means. The entity is guiding its worshippers to conquer all the human occupied territories and wipe out the humans while enslaving the worlds.
They are on a holy way.  Cain's eye contains the knowledge to stop them, if he can survive to use it.