For OSX 10.6.8 and up, and Windows XP and up.
SdrDx Links
Screen shot: https://www.flickr.com/photos/fyngyrz/13613345275/
Downloads: https://fyngyrz.com/?p=915
Documentation: https://fyngyrz.com/sdrdxdoc/sitemap.html
Changes: https://fyngyrz.com/sdrdxdoc/changes212.html
Please leave any comments you might have on the download page.