UNET
https://github.com/evanricard/UNET-Unity-Networking-
The Unity networking framework will be getting an update soon-ish...I know most developers opt for customized networking solutions but UNET will probably still be good to know.
^^
Lidgren-Networking
Lidgren.Network is a networking library for .NET framework, which uses a single UDP socket to deliver a simple API for connecting a client to a server, reading and sending messages.
^^
Netcode.IO
https://github.com/networkprotocol/netcode.io
netcode.io is a simple connection-oriented protocol built on top of UDP.
Developed by Glenn Fiedler
^^
Kayak-Games Networking
Basic networking system to connect to your own C# server but a pretty well-written system nonetheless!
^^



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