Other simulators
For a paper that I wrote about Logisim in early 2002, I performed a thorough search for tools similar to Logisim. I wrote the following at that time. An updated list.
Also check out Bill Yurcik's Computer system simulators for links to other simulators.
Graphical circuit tools
Tools that permit the user to draw and simulate a logic circuit. It seems everybody has to write their own version of this program; usually it's not very useful. The associated ratings are based on my own arbitrary preferences only; there is no particular system to them.
Applets
Type: open source
Author: David Eck
Year: 2000
Rating: 3 (of 4)
Note: also available as Java Virtual Machine application
Type: open source
Author: Iwan van Rienen
Version: 1.00b3
Year: 1996
Rating: 2 (of 4)
Type: free
Organization: Gordon College
Rating: 0 (of 4)
Type: free
Organization: Johns Hopkins University
Year: 2000
Rating: 0 (of 4)
Type: free
Author: Brian Boothe
Version: 0.97
Year: 1999
Rating: 0 (of 4)
Type: open source
Author: Kazuhiko Arase
Version: 1.2.1
Year: 2000
Rating: 0 (of 4)
Note: also available as Java Virtual Machine application
Cross-platform applications
Requires: Java Virtual Machine
Type: free
Author: Carl Burch
Version: 1.05
Year: 2002
Rating: 4 (of 4)
Requires: Java Virtual Machine
Type: free
Author: Andreas Tetzl
Version: 2.0beta
Year: 2001
Rating: 2 (of 4)
Requires: Tcl/Tk
Type: open source
Author: Donald Craig
Version: 0.3b0
Year: 1997
Rating: 1 (of 4)
Windows-specific applications
Digital Works
Type: freeware
Version: 2.0
Rating: 4 (of 4)
Note: I do not know of a permanent Web host for this version.
Type: commercial
Organization: Mecanique
Version: 3.0
Year: 2001
Rating: 4 (of 4)
Type: commercial
Organization: Research Systems Pty. Ltd.
Version: 2.04
Year: 2001
Rating: 2 (of 4)
Note: I have not tried this version, but it appears very similar to the earlier shareware version.
Type: free
Author: Ara Knaian
Version: 1.1
Year: 1994
Rating: 2 (of 4)
Type: free
Organization: Softronics
Year: 1997
Rating: 2 (of 4)
Type: free
Author: A Herz
Version: 3.2
Year: 1998
Rating: 1 (of 4)
Note: in German
Type: commercial
Author: Frank Zidar
Version: 1.0
Rating: 1 (of 4)
Type: commercial
Organization: Capilano Computing Systems Ltd.
Year: 1999
Author: Karl-Heinz Loch
Year: 2001
Note: in German
Non-Windows platform-specific applications
Requires: Macintosh
Type: free
Author: Arnaud Masson
Version: 3.0b
Year: 1996
Rating: 4 (of 4)
Simulation-only tools
Tools for simulating a circuit specified in a text file using a custom programming language. These tend to be more suitable for large circuits, like a full 32-bit CPU. But of course the learning curve is larger.
Requires: Unix, Tcl/Tk
Type: freeware
Author: Ethan Miller
Year: 2000
The Iowa Logic Specification Language
Requires: Pascal compiler
Type: freeware
Author: Douglas Jones
Year: 1998
Design-only tools
Tools for drawing circuits, but which do not simulate the circuit. Such tools are typically designed for more sophisticated design courses than are normally taught in computer science.
Requires: Windows
Type: freeware
Organization: Capilano Computing Systems Ltd.
Requires: Windows
Type: commercial
Organization: Capilano Computing Systems Ltd.
Demonstration tools
Tools related to circuit design but are best-suited for classroom demonstrations.
Organization: Uni Hamburg
Year: 2001
Note: Also available in German