Doom Legacy is a source port available for DOS, Win32, Linux, OS/2, and MacOS. It was originally written by Boris Pereira and Fabrice "faB" Denis, and is now maintained by Thierry "Hurdler" Van Elsuwé, with a supporting cast of 40 contributors. In 2000, Boom compatibility was introduced by Stephen "SoM" McGranahan, who also introduced Heretic support by merging in code from Heretic/Hexen; and FraggleScript from the port SMMU. SoM also developed some novel modifications, including several varieties of 3D floors and deep water before settling on the current implementation.