There is an interesting oscilloscope simulator , not much is known about the authors, other than the brief description of the reasons they chose to simulate this particular scope.
Oscilloscope simulator - [Link]
Enrico Mathesar writes:
This little gadget will simulate a 500 volt or less Geiger tube when driven by a signal generator of sufficient amplitude, typically 5 volts p-p or greater. The purpose is to generate a steady, precise number of counts per minute so that the Geiger counter’s meter may be calibrated.
Geiger Tube Simulator – [Link]
Stepping through this 595 shift register simulator is a good way to learn some logic chip fundamentals like shift registers and serial interfaces. [via]
595 shift register simulator – [Link]
This is an online electric circuit simulator based on Flash Player 10. Using it you can simulate simple circuits using batteries, lights, resistors, fan etc and use voltmeter, ammeter and ohm meter to measure various values of the circuit. Give it a try on the link below.
Online electric circuit simulator – [Link]
DCircuit Lab HD is a tool for simulating combinatorial and sequential digital circuits.
DCircuit Lab HD for simulating digital circuits – [Link]
iCircuit is a basic circuit simulator for iPhone. It includes a basic schematic editor and circuit simulator with multimeter and oscilloscope views. You can use it to design both analog and digital circuits and watch them working in real time as real circuits do. Supported elements include resistors, capacitors, inductors, transistors, diodes, logic gates. flip-flops and much more. [via]
iCircuit: Circuit simulator for iPhone - [Link]