Microbe Swarm is a B&W simulation of bugs flying around the screen.  You can set how many you want.  

Mr. Cycloid is a spirograph for 1980's early B&W Macs.  

Pagoda (Tower of Hanoi) is a Tower of Brahma simulation for very early Macs. It auto-plays until it solves the puzzle.  

Robot Arm is a nice B&W arm simulator that you can experiment with the mouse cursor.  Holding down the click button on the mouse grabs and releasing it releases whatever box you or object you grabbed.  Pulling the bottom/left lever...

  MotoSfera simulates the motion of a ball over a 3D surface. You can choose between three different surfaces. The best one, I guess, is sin (X^2+Y^2). Once MotoSfera is started, just set the initial speed conditions by choosing...

Vivarium is an interactive demonstration of the evolution of behaviour, displaying how behaviour adaptions tend to spread through a population of lifeforms. This artificial life simulator is quite complex. While the user can input some base...

StressTest is a stress level calculator.  It asks 20 multiple choice questions and depending on what you answer, you obtain a report that explains what your relative stress level is.  

Cellular Automata Program or simply "Automata" is a crude cell life simulation application with few options. It basically draws a continuous feed of B&W pixels.  

There was a time, in the deep dark past of humankind, that electronic circuit design was a cumbersome task. Circuits could be mapped with pencil and paper and component values estimated, but the circuit almost always had to be assembled (a task...

MicroGlobus is the Macintosh port of DOS MicroGlobus. The program was a port of the Globus World Computer Simulation developed at WZB in Berlin, Germany.

This software is missing, please upload it. Note: Evidence of this software existing in the very early 2000's is preserved on ARCHIVE.ORG  

MacBreadboard is a complex yet surprisingly simple to use electronics breadboard simulator for 68K Macs.  It features color (but also works on B&W Macs), drag and drop GUI ease of use and many, many switches, counters, logic gates, chips,...

This application is a simulator of the 6811, an 8-bit microcontroller by Motorola, and has been ported from a MS-DOS version by Ted Dunning.    The core of the simulator remained almost the same (and with small effort it would be...

A 2D gravity simulator. The technology would later be used in Space Cab. The READ ME includes a few game ideas people could play within the simulation.

LifeLab is yet another "game of life" simulator.  It works with large screen resolution as well as smaller ones and has many options to fiddle with.  You can for instance shift the whole pattern in a given direction by an...