Logic's Gate is a simple logic computer aided design tool. It is useful for creating and testing logic circuit designs. It is also especially useful for students who wish to see the individual states of the logic gates in a complex logic circuit, given specific inputs. It is written in Smalltalk and runs in Squeak 3.7 and greater. It requires Connectors 2 to be installed in the image in which it runs. Connectors 2 is available on Squeak Map from within Squeak.
InformationSpace is a causal set exploration tool. A causal set is basically a set of simple rules that define the relationship between bits in a space time. A common example of this is John Conway's game of life. InformationSpace supports 3D space/time (2D of space, 1D of time). Visualization is in 3D, with Y being time.