| GSAccounting | Class that keeps track of the costs, so you can request how much a block of commands did cost in total |
| GSAdmin | Class that handles communication with the AdminPort |
| GSAirport | Class that handles all airport related functions |
| GSBase | Class that handles some basic functions |
| GSBaseStation | Base class for stations and waypoints |
| GSBridge | Class that handles all bridge related functions |
| GSBridgeList | Create a list of bridges types |
| GSBridgeList_Length | Create a list of bridges types that can be built on a specific length |
| GSCargo | Class that handles all cargo related functions |
| GSCargoList | Creates a list of cargoes that can be produced in the current game |
| GSCargoList_IndustryAccepting | Creates a list of cargoes that the given industry accepts |
| GSCargoList_IndustryProducing | Creates a list of cargoes that the given industry can produce |
| GSCargoList_StationAccepting | Creates a list of cargoes that the given station accepts |
| GSCargoMonitor | Class that handles all cargo movement monitoring related functions |
| GSCompany | Class that handles all company related functions |
| GSCompanyMode | Class to switch the current company |
| GSController | The Controller, the class each GS should extend |
| GSDate | Class that handles all date related (calculation) functions |
| GSDepotList | Creates a list of the locations of the depots (and hangars) of which you are the owner |
| GSEngine | Class that handles all engine related functions |
| GSEngineList | Create a list of engines based on a vehicle type |
| GSError | Class that handles all error related functions |
| GSEvent | Class that handles all event related functions |
| GSEventAdminPort | Event Admin Port, indicating the admin port is sending you information |
| GSEventCompanyBankrupt | Event Company Bankrupt, indicating a company has gone bankrupt |
| GSEventCompanyInTrouble | Event Company In Trouble, indicating a company is in trouble and might go bankrupt soon |
| GSEventCompanyMerger | Event Company Merger, indicating a company has been bought by another company |
| GSEventCompanyNew | Event Company New, indicating a new company has been created |
| GSEventCompanyTown | Base class for events involving a town and a company |
| GSEventController | Class that handles all event related functions |
| GSEventExclusiveTransportRights | Event Exclusive Transport Rights, indicating that company bought exclusive transport rights in a town |
| GSEventGoalQuestionAnswer | Event Goal Question Answer, where you receive the answer given to your questions |
| GSEventIndustryClose | Event Industry Close, indicating an industry is going to be closed |
| GSEventIndustryOpen | Event Industry Open, indicating a new industry has been created |
| GSEventRoadReconstruction | Event Road Reconstruction, indicating that company triggered road reconstructions in a town |
| GSEventStationFirstVehicle | Event Station First Vehicle, indicating a station has been visited by a vehicle for the first time |
| GSEventSubsidyAwarded | Event Subsidy Awarded, indicating a subsidy is awarded to some company |
| GSEventSubsidyExpired | Event Subsidy Expired, indicating a route that was once subsidized no longer is |
| GSEventSubsidyOffer | Event Subsidy Offered, indicating someone offered a subsidy |
| GSEventSubsidyOfferExpired | Event Subsidy Offer Expired, indicating a subsidy will no longer be awarded |
| GSEventTownFounded | Event Town Founded, indicating a new town has been created |
| GSEventVehicleCrashed | Event Vehicle Crash, indicating a vehicle of yours is crashed |
| GSEventWindowWidgetClick | Event Window Widget Click, when a user clicks on a highlighted widget |
| GSExecMode | Class to switch current mode to Execute Mode |
| GSGame | Class that handles some game related functions |
| GSGameSettings | Class that handles all game settings related functions |
| GSGoal | Class that handles some goal related functions |
| GSIndustry | Class that handles all industry related functions |
| GSIndustryList | Creates a list of industries that are currently on the map |
| GSIndustryList_CargoAccepting | Creates a list of industries that accepts a given cargo |
| GSIndustryList_CargoProducing | Creates a list of industries that can produce a given cargo |
| GSIndustryType | Class that handles all industry-type related functions |
| GSIndustryTypeList | Creates a list of valid industry types |
| GSInfo | 'Abstract' class of the GSs use to register themselves |
| GSInfrastructure | Class that handles all company infrastructure related functions |
| GSList | Class that creates a list which can keep item/value pairs, which you can walk |
| GSLog | Class that handles all log related functions |
| GSMap | Class that handles all map related functions |
| GSMarine | Class that handles all marine related functions |
| GSNews | Class that handles news messages |
| GSOrder | Class that handles all order related functions |
| GSRail | Class that handles all rail related functions |
| GSRailTypeList | Creates a list of all available railtypes |
| GSRoad | Class that handles all road related functions |
| GSSign | Class that handles all sign related functions |
| GSSignList | Create a list of signs your company has created |
| GSStation | Class that handles all station related functions |
| GSStationList | Creates a list of stations of which you are the owner |
| GSStationList_Vehicle | Creates a list of stations which the vehicle has in its orders |
| GSSubsidy | Class that handles all subsidy related functions |
| GSSubsidyList | Creates a list of all current subsidies |
| GSTestMode | Class to switch current mode to Test Mode |
| GSText | Class that handles all text related functions |
| GSTile | Class that handles all tile related functions |
| GSTileList | Creates an empty list, in which you can add tiles |
| GSTileList_IndustryAccepting | Creates a list of tiles that will accept cargo for the given industry |
| GSTileList_IndustryProducing | Creates a list of tiles which the industry checks to see if a station is there to receive cargo produced by this industry |
| GSTileList_StationType | Creates a list of tiles which have the requested StationType of the StationID |
| GSTown | Class that handles all town related functions |
| GSTownEffectList | Creates a list of all TownEffects known in the game |
| GSTownList | Creates a list of towns that are currently on the map |
| GSTunnel | Class that handles all tunnel related functions |
| GSVehicle | Class that handles all vehicle related functions |
| GSVehicleList | Creates a list of vehicles of which you are the owner |
| GSVehicleList_Depot | Creates a list of vehicles that have orders to a given depot |
| GSVehicleList_SharedOrders | Creates a list of vehicles that share orders |
| GSVehicleList_Station | Creates a list of vehicles that have orders to a given station |
| GSViewport | Class that manipulates the user's viewport |
| GSWaypoint | Class that handles all waypoint related functions |
| GSWaypointList | Creates a list of waypoints of which you are the owner |
| GSWaypointList_Vehicle | Creates a list of waypoints which the vehicle has in its orders |
| GSWindow | Class that handles window interaction |
