Custom Mario Engine - Used in Super Mario and the gray coins and in Super Mario 7.
Custom Mario Engine 2 - Used in a scrapped project. Enhanced SMaTGC engine that supports running, duck, SMB3 like map programming, Better enemy code and multiple powerups.
Super Mario 256 Engine - Complex custom Mario Engine used in Super Mario 2020 / 256.
Gamemaker Studio
Gamemaker Studio 2 (Only mobile and HTML5 games currently)
The Custom Mario Engine 2 and Super Mario 256 Engine are 100% built (programmed) from the ground to fully functional by me. The SM256 Engine is not fully modular.