Oh, nice to see you helping to improve the mod. Big thanks, because I really liked it. Besides, you need to remember that some words even when being of very similar "construction" might mean different things across languages due to cultural and historical bias. In this case Polish "invigilation" is basically considered to be the same as "government surveillance" even though not really correct.
But we're getting off topic here, so let me toss a couple titles here.
Walls Closing: a small cozy minicampaign of "untold battles of Second Shivan Incursion" variety, a search and rescue operation for Phoenicia after she got mauled by the Sathanas in Bearbaiting.
Mantle: medium length Vasudan campaign, post-FS2 era - you play as a Hammer of Light insurgent but things go wrong at some point.
Uncharted Territory: medium length campaign, you are a pilot within a GTVA unit that got lost while conducting an experiment and you need to find your way back home.
Twisted Infinities - recent release from FSCRP, seems to be a medium campaign about post-Capella troubles of Epsilon Pegasi.
Trimurti - you play as the Shivans in FS1. Very alien and pretty horrifying experience. Good stuff.
The Antagonist - short campaign, some basic plot not related to FS and a very arcade battle experience. Intense gameplay.
Sol: A History - basically the history of what happened in Sol between FS1 and events of Inferno continuity - a good place to start chronologically playing the Inferno "timeline".
Just Another Day - a massive in scope Freespace comedy. Lots of anime content in newer parts.