What is BYOND?
BYOND  stands for Build Your Own Net Dream, and is a game development environment and engine, designed for making 2D multiplayer online games.  If you are looking for game development software for creating multiplayer games, then BYOND is for you!  Oh, and did I mention?  It's free!  Not just free to download and use, but also free to publish your games!​
Official Site

Multiplayer Shooter
Made with BYOND by Tyruswoo Team

Multiplayer Online RPG
Made with BYOND by Tyruswoo Team