Signblazer has a fully functional free trial version. I tried to buy it but they don't make it easy. Here's a link: http://support.uscutter.com/index.php?/Knowledgebase/Article/View/19/0/download-signblazer-software
Our cutter is a US Cutter brand and it works great. Seems to support lots of brands.
The software works great to import lots of file types and converts them pretty well too. Youtube was my best friend when we got started..
-Steve