Thief: The Dark Project is 25 years old, but it's still one of the best stealth games around, with an active community making fan missions for both it and The Dark Mod, a standalone recreation made with the Doom 3 engine of all things. The Black Parade is for Thief Gold rather than the Dark Mod, the definitive 1999 rerelease with extra maps, which is the version you'll find going for seven bucks on Steam today.
The Black Parade is the work of a team called Feuillade Industries, led by project director Romain Barrilliot. Barrilliot currently works as a level designer at Arkane Lyon and has credits at 3D Realms and Streum On, but he's also a modder, having worked on Sven Co-op for Half-Life and one of my favorite Thief fan missions, The Sound of a Burrick in a Room.
