I was always interested in Reciprocity. Seemed like it had a really good back story worked out, and that is, afterall, what made freespace so good. I know Casualties of War was released but its never worked on FSO for me so I aint gotten around to playing it.
The Procyon Insurgency seemed interesting too. Taking a more indepth look at the universe, again seemed to be plot based.
And lastly. Whatever happened to Combat Federation? I thought I remembered hearing something about it being (nearly) finished. It just had to wait for another project to be released first because it used the same mods? Anyone?