I downloaded wbExam a few weeks ago. It does not have the weighting options, but does allow radio, check box and open answer questions through php. It was available on:
http://kanslozebagger.org/wbexam
however, it looks like they are either having hosting problems or took down the site. Might find it on a mirror site somewhere, or wait until they come back up.
Cheers,
JC
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cippguide.org
