Alternatives to Photon Realtime

FishNet

FishNet suits Unity game developers who need a client-server networking solution and want to choose or operate their own host.

It is for developers building real-time multiplayer games that need an authenticated UDP client/server transport.

Normcore

Normcore suits Unity teams building multiplayer games, esports, remote collaboration tools, live events or installations.

Amazon GameLift Servers

Game developers and operators needing dedicated multiplayer hosting, matchmaking, autoscaling, and cross-platform servers may fit GameLift Servers.

It suits game developers needing a UDP transport layer with reliability options, encryption, peer-to-peer networking, and diagnostics.

Photon Fusion

Fusion suits game developers building multiplayer projects with supported engines and choosing among different network topologies.

Mirror Networking

Mirror suits Unity developers building multiplayer games that need server-client networking across desktop, mobile, WebGL, or Linux servers.

It suits Unity developers making multiplayer games with smaller player counts and less complex game logic, or adding multiplayer to an existing GameObject-based game.

Photon Quantum

Quantum suits Unity teams building online multiplayer games that need deterministic simulation and rollback.

DarkRift 2 suits developers building authoritative multiplayer servers with Unity or .NET who need TCP/UDP transport and clustering.

It suits teams building multiplayer games or other multiuser applications that need server-side extensions and real-time analytics.

Netick suits Unity developers building client-server multiplayer games who need state synchronization, prediction, replay, or matchmaking.

Steam Input

Steam Input suits players configuring supported controllers and developers adding controller support to games.