Sigma-X is a GZDoom episode consisting in 10 maps using the full power of the OTEX textures made by Ukiro that will recreate different themes ranging from the classic tech bases to hell and void themes introducing an extended bestiary and arsenal to fight them.
Doom 2 IWAD and GZDoom 4.0+ required. Hardware-accelerated rendering mode strongly recommended, both for visual and performance reasons. For the current version, OTEX textures must be loaded as well.
Current demo has 5 maps (1 to 3 + 5 and 6). Check the channel topic at the top for the link. It also includes OTEX 1.1