Unsung, a World War I adventure in Wolfenstein 3D, lets you slog through the trenches in true pixelated FPS fashion.
Note this an older out of date version of Unsung. It is recommended that you download and play v1.1, this is kept here simply as a sort of archive of sorts. Unsung v1. Contains all files, to run mod no installation necessary just unzip and run unsung.exe.