Hammond Clones are instruments, mostly keyboards or software, which emulate the sound of a HammondOrgan. The main advantage of a clone is its portability compared to an actual Hammond.
Here is a list of some of the available clones.
KeyB (both single and dual manual models)
http://www.native-instruments.com/index.php?b4_us
http://www.soundfonts.it/?a=read&b=13
http://www.csounds.com/jmc/Instruments/instruments.htm
http://www.dsv.su.se/~fk/beatrix_home.html
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