Delta Engine is an open-source .NET-based framework for 2D and 3D game development, using C#, C++, or JavaScript. It supports physics, model importing, and particle effects, ideal for cross-platform games. Delta Engine targets Windows, macOS, Linux, Android, iOS, and HTML5, with a visual editor for productivity. Its community is smaller, but documentation aids learning. While less active since 2014, it suits .NET developers creating mobile or desktop games. Delta Engine’s unified 2D/3D code makes it versatile, though it’s less polished than modern engines like Godot.