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|Super Mario Bros. X<refgroup="N">The Super Mario Bros. X fan game project was written in VB6 originally and being a closed source for a long time. It was founded in 2009 and supported up to 2011, later abandoned by its author. For a long time, various people hacked it and attempted to reverse-engine and make clones. After 11 years, the source code was finally open. Later, by an independent developer, it was ported from VB6 into C++ with the SDL2 library and released as "TheXTech". The TheXTech, unlike the original game engine, is cross-platform and lightweight. It's able to work on a variety of operating systems and processor architectures.</ref>