Disrupt Engine

Watch Dogs 1/2/Legion - XBG, HKX, materials, shaders, audio, modding workflow

Dunia / Far Cry

FC1–FC6 - XBG, .cgf lineage, shader system, FCModInstaller guides

Havok

HKX packfile, version compat, license keys, parsers & tools, SDK availability

Bethesda

FO4/Skyrim/Oblivion/Starfield - archives, NIF, Havok animation, guides

Reference Hub

Index - format specs, guides, and XeNTaX knowledge docs