Esoterica Engine is an open-source 3D game engine written in C++, designed as a starter framework for custom projects. It supports modern rendering, physics, and scripting, ideal for simulations or small 3D games. Esoterica targets Windows, macOS, and Linux, with a modular design for extensibility. Without a visual editor, it suits C++ developers, with minimal documentation and a niche community. Its MIT license ensures openness, though it’s less mature than O3DE. Esoterica’s focus on customization makes it perfect for hobbyists or developers building tailored 3D engines, but 2D support is limited. Suitable for experimental projects requiring low-level control.