Hello Mario Engine (formerly called Hello's Mario Engine, Hello Engine) is a feature-packed, fully-documented, easy-to-use Super Mario game engine for GameMaker: Studio, developed by Hello Fangaming from MFGG (Mario Fan Games Galaxy) in 2007. It enables anyone to make a Mario game with ease. Even better, it's free and open-source (under the new BSD License), which means you can make whatever you want with this engine, without any restrictions.

Super Mario Bros. X (short for SMB-X or SMBx) is an excellent fan-made game originally developed by Andrew Sprinks (screen name: Redigit). It blended all the classic elements of Super Mario 1, 2, 3 and World along with many new added practical props, such as Ice Flower, Hammer Suit, Tanooki Suit, Kuribo's shoe, The Billy Gun, Yoshi, and more.