You can send files.
Chat system built on unity Netcode for GameObjects with command and voting support
Netcode for GameObjects is a high-level netcode SDK that provides networking capabilities to Game...
A Unity tool that will allow you to easily implement Twitch chat commands into your game!
Movement Server & Client.
A unity client SDK for netgo
2016年度 HAL専科用WebSocketSample.
A really simple C# networking library, UDP.
a better alternative to unity SendMessage and BroadcastMessage
Lite reliable UDP library for Mono and .NET
Video description https://www.youtube.com/watch?v=ntqxSSWG66g