The best Game Development alternative to Photon Engine is Nakama, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Photon Engine and six of them are Game Development Tools so hopefully you can find a suitable replacement. Other interesting Game Development Tool alternatives to Photon Engine are PlayFab, Steamworks, Colyseus and Reactor Multiplayer Engine.
Nakama is an open-source distributed social and realtime server for games and apps. It has a large set of services for users, storage, and realtime communication; as well as specialized APIs like realtime multiplayer, groups/guilds, and chat.
Steamworks is a free suite of tools available to any developer to use in their game or software on Steam. Here is a small sampling of the available features:
Colyseus is a Authoritative Multiplayer Game Server for Node.js. It allows you to focus on your gameplay instead of bothering about networking.
Reactor is a fully server-authoritative multiplayer system which includes integrated hosting and orchestration as well as the most efficient networking stack available.
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