"Being John Blazkowicz" is a brand new and mostly vanilla SDL mod for Wolfenstein 3D with 30 levels (4 of which are secret levels) to play through with seamless level progression.
This is a standalone mod, so you won't need anything else to play this. Just unzip the contents of the .zip file and run the Wolf4SDL executable. If you want to play with cheats, then just run the CHEATS batch file.