Unofficial Hitman fan forum.
The Hitman subreddit.
Roulette for Hitman 2016 and Hitman Blood Money that suggests random extra objectives for missions.
Tool that tracks mission statistics in Hitman 2: Silent Assassin and Hitman Contracts in real time.
Tool that tracks mission statistics in Hitman Blood Money in real time.
Maps for Hitman 2016, covering items and interactable objects in each map.
Blog about Hitman's storyline and lore
Unofficial Hitman Wiki