I run the game (using Unisystem), but only once a year at an annual convention.  To date I've done two sessions.

My game is a continuation of The X-Files, so the elevator pitch is a supernatural mystery where the protagonists are FBI facing a massive conspiracy with alien colonization in the background.  Thus, a bit of alien colonist/government conspiracy.  The first session dealt with that Mythology, while the second one was a Monster of the Week.

What would be great would be: an adventure, or NPCs, or anything that fits the genre of the game, though I am not using the default setting material (even though it's pretty close in tone and content).

I haven't really used other RPG stuff that I can think of.  Perhaps a tiny bit of old Top Secret stuff.  Mostly I use the net and the rules, and make up stuff myself.  This year I did glean a little bit from C.J. Carella's Witchcraft, to help out with some mechanical stuff.

Obviously, The X-Files (show and movies). image