BYOND - BYOND is the premier community for making and playing online multiplayer games.
Kodu Game Lab - Kodu lets kids create games on the PC and XBox via a simple visual programming language.
Defold Engine - Defold lets you quickly build high performing, cross-platform games together with your team.
Ceilfire - Ceilfire is an online game maker for creating HTML5 games and sharing game assets. Make play and share games directly in your browser! Make Your Own Game!
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.
Flowlab - Flowlab is an online game creator. Make your own games to share with friends.