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https://mupdf.com/
http://www.sorentioapps.com/document-converter
http://www.micre13b.com/xps-to-pdf-converter.html
http://www.sumatrapdfreader.org/
http://www.nuance.com/print-capture-and-pdf-solutions/pdf-and-document-conversion/pdf-reader.html
http://www.freepdfsolutions.com/free-xps-to-pdf-converter.html
http://www.uvviewsoft.com/uviewer/index.htm
https://www.onlyoffice.com/
http://www.softpedia.com/get/Office-tools/Other-Office-Tools/aReader.shtml
http://www.xpsdev.com/xps-annotator
http://www.xpsviewer.com/
http://www.softpedia.com/get/Office-tools/Other-Office-Tools/Danet-Studio.shtml
http://www.opentext.com/what-we-do/products/enterprise-content-management/content-centric-applications/opentext-brava/opentext-brava-reader
https://www.gonitro.com/pdf-reader
http://www.dopdf.com/
http://stdutility.com/stduviewer.html
http://wfpbookreader.codeplex.com/
https://open-freely.en.softonic.com/
https://free_opener.en.softonic.com/