WorldForge is described as 'The WorldForge project is the original open-source MMORPG project, dating back to 1997' and is an app in the Development category. There are more than 25 alternatives to WorldForge for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Android. The best alternative is Godot Engine, which is both free and Open Source. Other great apps like WorldForge are Unity (Free Personal), Unreal Engine (Free), CRYENGINE (Free Personal) and Torque 3D (Free, Open Source).
Godot is a fully featured, open source, MIT licensed game engine. It focuses on having great tools, and a visual oriented workflow that can export to PC, Mobile and Web platforms. It is a cross-platform 2D and 3D game engine and game development IDE.
Unreal Engine is a professional suite of tools and technologies used for building high-quality games across a range of platforms. Unreal Engine’s rendering architecture enables developers to achieve stunning visuals and also scale elegantly to lower-end systems.
Stride (formerly Xenko) is an open-source C# game engine designed for the future of gaming. It comes with a full toolchain and is especially well suited to create realistic games but allows you much more!.
Cocos Creator is a complete package of game development tools and workflow, including a game engine (based on Cocos2d-x), resource management, scene editing, game preview, debug and publish one project to multiple platforms.
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.