A new weapon pack for Unreal Tournament, containing over 15 new weapons, including nuclear weapons, drones, freezing and flaming guns, and the list goes on... It's also the sequel to the old Nali Weapons II X.
XHL/XDM is a Half-Life modification with quite a long history. It started in 2000 as a HL enhancement and over almost 15 years turned into a game comparable to Unreal Tournament! And a open-source modding platform!