I'm a minor contributor to this project, under the name Solon Halwinder, and wanted to share with you guys. Parallel Universe adds a large number of missions to the basic Privateer Remake, new ships, ship variants, equipment, and some progress-based (in the new missions) equipment unlocking.

http://pu.wcjunction.com

There is no downloadable installer; they use an Apache Subversion repository. Download directions are at http://pu.wcjunction.com/downloads.html