tkgate 1.8.7-2 (armel binary) in ubuntu natty

 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.