Scriptblocks 2
rdococ

Adds nodes that can be used to build reusable programs.

Block Exchange
BuckarooBanzai

Cloud worldedit schema exchanger

Numeracy
amalon

Adds blocks for exploring numeracy with children, which join together and change appearance as in the Numberblocks TV programme.

Cellestial Game
LMD

Game of Life in three dimensions.

MathPlot
kyleclaassen

A tool for constructing mathematical curves/surfaces/solids.