Craftable engine parts. Hardly the first mod to do this, but balanced in a way that's kinda inbetween the other offerings in a niche I felt was not available yet.
Easily set the time of your world to what ever you want, or enable system time synchronization with Day length set to Real-time and your server will always boot at the current system time.
This mod adds a variety of zones into the game which gives zombies outfits to match their surroundings. It also adds over 140 custom outfits which are appropriately placed on zombies in the world.