Multiplayer Server Browser - Master Server - Server Listing in Code Plugins - UE Marketplace

This Plugin allows you to make a servers browser to get a list of your online multiplayer dedicated and listen servers for any platforms.

Multi-User Server User Interface in Unreal Engine

How to Set Up Jenkins on Kubernetes - Gcore

How does your website work? - Quora

MyRustServer - Tools - Codefling

GitHub - getnamo/SocketIOClient-Unreal: Socket.IO client plugin for the Unreal Engine.

Advanced Dedicated Server Matchmaking V2 in Code Plugins - UE Marketplace

GitHub - getnamo/SocketIOClient-Unreal: Socket.IO client plugin for the Unreal Engine.

There is a paid cross-platform 3rd Party VOIP Plugin in the Payday 3 games files, most likely coming soon as a feature. : r/paydaytheheist

Server Finder Widget - #5 Unreal Engine 4 Steam Multiplayer Essentials