Moodle Test Question Importer by Respondus

Their "QTI Importer plug-in allows the importing of test questions that have been exported from Respondus 3.5 in an XML format known as the IMS QTI. Respondus Inc. recently updated this plug-in and will provide maintenance and support of this code in the future" The page I've linked to has FAQs that explain what the Respondus QTI Importer can do -- and what it can’t.