Lumix Engine is described as 'open-source 3D game design software and engine. It's written in C++ and supports several scripting languages' and is a Game Development Tool in the Development category. There are more than 25 alternatives to Lumix Engine for a variety of platforms, including Windows, Linux, Mac, BSD and iPad. The best alternative is Unity, which is free. Other great apps like Lumix Engine are Torque 3D (Free, Open Source), OGRE (Free, Open Source), Pygame (Free, Open Source) and Grit Game Engine (Free, Open Source).
Ursina makes it easier to develop games, visualizations and other kinds software. The concise API combined with the power of the Python programming language, makes life easier for the developer so they can focus on what they are making.
Mycosm is a platform for creating 3D applications, designed to be used by a broad range of developers for many industries. For example, games, engineering simulation, education, visualization, decision support etc. Mycosm consists of a studio tool and freely distributable player.
General Features Capable WYSIWYG editor IntrinsicEd Fully multithreaded renderer and engine core Data oriented engine design and data driven rendering process, inspired by the great blog posts of the Bitsquid/Stingray team  Hot reloading of textures...