Urho3D is a free lightweight, cross-platform 2D and 3D game engine implemented in C++ and released under the MIT license. Developed by Lasse Öörni
License: Open Source
Urho3D is a powerful open-source engine focused on 3D game development, requiring programming skills, while RPG Maker is designed for creating 2D RPGs with a user-friendly interface, catering primarily to non-programmers.