NeoAxis Engine is a versatile game development platform designed to empower creators in building 3D applications and games. It uses the powerful open-source engine OGRE as a rendering engine, and supports .NET language, builds in C# and Visual Scripting, and more. It provides a robust environment for both novice and experienced developers.

Defold is a free and open-source game development framework for Windows, Mac and Linux platforms. It's renowned for its intuitive design, powerful features, and extensive community support. Its focus on rapid iteration and collaboration makes it an ideal choice for teams of all sizes, from solo developers to large studios.

Gideros is a free, open-source and cross-platform game engine, developed by Gideros Mobile from Turkey in 2011. It allows developers to quickly and easily create various types of applications and games for both mobile and desktop platforms, including iOS, Android, Windows, and Mac.

GDevelop is a free, open-source and cross-platform 2D game engine designed to be used by everyone, originally created by Florian Rival (4ian) from United Kingdom in 2008, using C++ and JavaScript. We can use it to create any type of 2D game for Windows, Mac, Linux, iOS and Android platforms, as well as HTML5 Web browsers, Steam platform and Universal Windows Platform.

Godot is a completely free, open-source, cross-platform, and lightweight 2D + 3D game engine. It started as a 2D game engine, but later expanded its capabilities for 3D game development. Compared with many other game engines, it is small in size, rich in features, simpler and easier to use, and more friendly to the novice game makers. The games made with Godot can be simultaneously released to Windows, Mac, Linux, Android, iOS, UWP, and HTML5 platforms.