This page details how you can add your own Factions to Modules, for the stock list of Factions in Horizons, see Factions
Modules -
Commodities || Components | Resources | Ordinance
World Building || Companies | Dialogs | Encounters | Events | Factions | Maps | Models | Screens | Vessels
Names || NPCs | Systems | Vessels
Story || Campaigns | Missions | Encyclopedia
Missions - Players | Spawn Points | Objectives | Comm Channels | Objects | Encounters | Events | Variables | Waypoints | Scripting