Apps with 'Networking and Multiplayer' feature

Unity is a multi-platform game development tool, designed from the start to ease creation.

AppGameKit is a simple cross platform game development tool that runs on Windows, Linux, MacOS and Raspberry Pi. A version to run on Android and iOS is also available.

Welcome to blobgame.io. This is an improved of Agar.io that has a lot of improvements wanted by people.

AGKSharp is a free implementation of AppGameKit to be used with C# and .NET.