Polytools
Server-side mod that adds various tools or gives existing tools new uses. This is done using the Polymer library.
Wrench
The wrench can be used to rotate places blocks like logs, stairs or slabs.
Magnet
The magnet, while in the players hotbar or hand, sucks in items around them. There is also a Demagnetizer block, which disables this effect for items in a certain range around it.