Formerly part of the MineTinker-Plugin, this is now a standalone. Have the Elevator-functionality without the Modifiers and tool-enhancing Plugin around it.
The Elevators are easy to use, just by jumping to go up and sneaking to go down.
You need to place a block above the hopper and the two (or more) hoppers need to be exactly above each other.
Crafting:
Demonstration (starting at 4:32):