This is an MD2 models set for ZDoomGL 0.66 packed up by somebody named slayer226.
I'm not sure if this is the latest set ever made for ZDoomGL, but it's the most recent one I've found over the internet.
Installation instructions:
I assume in this article that you've already successfully installed and configured ZDoomGL 0.66. Download ZDoomGL archive and unpack it to the game folder (which was 'D:\games\doom' in my example).
Start 'ZDoomGL.exe' to run the game.
After the game is loaded, open 'Options'->'Display Options'->'OpenGLOptions'. Ensure that the following values are set as following:
'MD2 Support' to 'Interpolated'
'Maximum MD2 Lights' to a maximal value.
Start the game and enjoy.
This models pack is surely not the best choice nowadays, but it's not that bad and definitely worth a try.