Lightweight C# networking solution for multiplayer games.
Netick is a C# networking solution for Unity.
#1 Open Source Unity Networking Library
Easy to use high performance Network library for Unity 3d
A Purrfect Unity Networking Solution
Simple, message based, MMO Scale TCP networking in C#. And no magic.
Higher level implementation for LiteNetLib (https://github.com/RevenantX/LiteNetLib)
FishNet: Unity Networking Evolved.
Deterministic Unity & Godot framework for rollback, lockstep & server-authoritative multiplayer. Engine-agnostic pure C# core, FP64 fixed-point math, ECS, physics, navigation, and replays — frame-perfect, cross-platform reproducible.