Game
Lua_ConstGame (holds game relevant constants & variables)
Lua_UnitDefs
Lua_WeaponDefs
Lua_FeatureDefs

Commands
Lua_CMDs (documents all CMDs and CMDTYPEs)
UI_commands

Game Dynamics
Lua_SyncedCtrl
Lua_SyncedRead

Local Dynamics
Lua_UnsyncedCtrl
Lua_UnsyncedRead

OpenGL
Lua_OpenGL_Api
Lua_GLSL_Api (OpenGL Shading Language)
Lua_FBO_and_RBO (Framebuffer and Renderbuffer Objects)
Lua_ConstGL (some OpenGL constants)
Lua_UnitRendering (manage unit LODs and materials)

Unit Physics
Lua_MoveCtrl (changes the physics of single units)
Lua_PathFinder

Engine
Lua_VFS (used to access files in the virtual filesystem, e.g. modfiles)
Lua_Scream
Lua_BitOps