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Freespace 2 Source Code Project
Open source effort to improve the game with modifications and improved graphics.
http://scp.indiegames.us/

Robotech Mod
A modification of Freespace 2 for Robotech, including ships, skins, and models.
http://robotechlan.com/freespace2

Twisted Infinities
A custom campaign. Includes features, screenshots, downloads, forums and new ship information.
http://www.sectorgame.com/twistedinfinities/