There's also VirtualBox (inherited from Sun). And probably some other things. Although from what I heard you risk being besieged by aggressive Oracle salespeople if they suspect you're using one of the proprietary "extension pack" features. This sort of thing is why I would think very hard before using anything from Oracle.
Made this mistake w VirtualBox once - never again. I ended up somehow running the proprietary version which “phoned home” and some 30 or 60 days later corporate got a call. When it comes to Oracle, I take Nancy Reagan’s advice [0].
