Dark Children

TBP Campaign, for starters. Not compatible with FSO that isn't running TBP stuff as a mod at minimum.

Dark Children is more a proof-of-concept set of missions than an actual campaign, but that said, it's well worth playing through. It uses several "new" features not seen previously in other campaigns, including in-mission jumping and a version of the "bullet time" made famous by the Matrix movies, and it is certainly set from a unique viewpoint.