Logisim

Logisim is an educational tool for designing and simulating digital logic circuits. With its

simple toolbar interface and simulation of circuits as you build them, it is simple enough to

facilitate learning the most basic concepts related to logic circuits. With the capacity to

build larger circuits from smaller subcircuits, and to draw bundles of wires with a single

mouse drag, Logisim can be used (and is used) to design and simulate entire CPUs for

educational purposes.

Logisim is used by students at colleges and universities around the world in many types of

classes, ranging from a brief unit on logic in general-education computer science surveys, to

computer organization courses, to full-semester courses on computer architecture.