[Vol-users] Third Party plugins

Hello, I am trying to see if there is a list or repository anywhere for third party plugins .  Also, I am running the hivescan with the1.3 Beta.  I dumped the hivescan plugin package in the Volatility directory, but when I run it I am getting the message: Error: Invalid module [ hivescan ].  Are there any docs to address running third party apps with Volatility ?  I am running it on Windows. Thanks