Following the successful Microsoft example of MSDN and the not so successful VMware example of VMTN, Parallels is now launching its own developers community network, also preparing to enter the virtual appliances market.
Quoting from official announcement
Parallels, Inc., maker of award-winning desktop virtualization solutions for Windows, Linux and Mac OS X, announced today the Parallels Technology Network (PTN) – an online community for users, as well as developers using Parallels virtualization technology to deliver their software in self-contained virtual appliances.
Via the PTN, which is available online at http://ptn.parallels.com, users and developers will have access to a wealth of information related to Parallels virtualization technology. In addition, developers can make their software available to Parallels users as virtual appliances…
According to this announcement Parallels already exposed its Virtual Appliances Directory.