Being in development since 2009, LNGA once was a retro-style extensive Duke Nukem 3D mod (total conversion) based on EDuke32. Using 8-bit visuals, it aims to introduce new techniques such as HDR rendering and dynamic lighting, as well as better sound, physics and more complex game mechanics.
I'm still drooling over the idea of an in-game level editor akin to LeBUILD <3