I tried to download Mindtouch Core, but that seems not possible via http://www.mindtouch.com/downloads.
When I choose "MindTouch Core (6 supported OS) -> Source Code Installation" and click on "Start Download" I'm redirected to the page http://campaign.mindtouch.com/adv/thanks?copy=platform where the title is "MindTouch Platform v.10 - Get Your Trial Copy Today". So I don't want to download "MindTouch Platform v.10" (Whatever this is), I'd like to download MindTouch Core.
It seems that Mindtouch does more and more hide the OpenSource Version. I hope that they don't close the source in the future and make it a pure Closed Source Commercial product...