her are some single player mods to check out
http://www.moddb.com/mods/freelancer-mostly-harmless/downloads/freelancer-mostly-harmless-open-sp-02b-mp

http://www.moddb.com/mods/discovery-freelancer/downloads/discovery-freelancer-487-conquest

http://www.moddb.com/mods/genesis-mod/downloads/genesis-11-osp

http://www.moddb.com/mods/shattered-worlds/downloads/swwt-v167
http://www.moddb.com/mods/the-order-mod/downloads/the-ordermod-opensingle-player