tkgate 1.8.6-2ubuntu2 (ia64 binary) in ubuntu gutsy

 TkGate is a event driven digital circuit simulator with a Tcl/Tk-based
 graphical editor. TkGate supports a wide range of primitive circuit
 elements as well as user-defined modules for hierarchical design. The
 distribution comes with a number of tutorial and example circuits which
 can be loaded through the "Help" menu. The example circuits include a
 simple CPU, programmed to run the Animals game. For more information,
 check out the online documentation at http://www-2.cs.cmu.edu/~hansen/tkgate/