Dye Mixer
The Manual says using this machine to get Dyes is more efficient that the just crafting Dyes together. Insert some Red Dye, Green Dye, and Blue Dye to fill up the Red, Green, and Blue meters. Then insert a Laser Lens of the color Dye you want. This machine also requires power to use.
Froster
By supplying this machine with power and water, you can use this machine to produce Snowballs, Ice, and Packed Ice.
Villager Trade Exchanger
Insert a Mob Imprisonment Tool with a captured Villager inside and this machine will allow you to access to all of the unlocked trades for that villager. This machine must be connected to power to work.
Wither Builder
When provided with power, 3 Wither Skulls, and 4 Soul Sand, this machine will spawn the Wither in the work area.