This soundcard host a genuine SID chip, they say :
http://www.hardsid.com/
This synth is built around a SID chip too, but it's out of stock :
http://www.sidstation.com/
As for software, Reason v2 hosts a new synth, the Malstrom. It is possible to emulate old synth sounds using it. For an exemple, you can listen to my retro tune,
Mistery Island. All the synth sounds were programmed on Reason's Malstrom Synth.