Fall of Epsilon Pegasi takes place during the main FS2 campaign. Its the events taking place when the NTF invade that system just prior to the Colossus' initial deployment.
Vassago's Durge takes place during the later end of the FS2 campaign.
Uncharted Territory is listed as an FS2-era campaign but I can't see exactly by the description.
Cleaning Crew is listed as Post-FS2.
Warzone and Aftermath are both post-FS2 campaigns and are part of the Cold Element continuity, but I believe that they take place before Derelict, which is also in that continuity. Derelict is one of the longest user-made campaigns. I'm currently playing through it myself.
I would like to point out however, that not all of these are voice acted, and so far you have limited yourself to voice-acted campaigns exclusively.
For more info on these and other campaigns, check out the list
HERE.