Photon Fusion
Photon's high-performance Unity SDK with host, shared, and dedicated-server topologies plus cloud relay.
Why use it
Mature prediction and the global Photon Cloud shorten networking work for real-time action games.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
It is proprietary and CCU capacity is plan-based, creating service dependency; console certification requires separate access.