Class List
Here are the classes, structs, unions and interfaces with brief descriptions:
[detail level 12345]
 NAdaptivePath
 NAddonManager
 Naddonmanager_macro
 Naddonmanager_workers
 NAppThe FreeCAD Application layer
 NArchAxisAxis system for the Arch workbench
 NArchBuildingPartThe BuildingPart object and tools
 NArchCommandsUtility functions for the Arch Workbench
 NArchComponentThe base class of all Arch objects
 NArchCurtainWallThe Curtain Wall object and tools
 NArchIFC
 NArchIFCView
 NArchMaterialThe Material object and tools
 NArchNesting
 NArchPanelThe Panel object and tools
 NArchProfileProfile tools for ArchStructure
 NArchReferenceThe Reference object and tools
 NArchScheduleThe Schedule object and tools
 NArchSectionPlaneThe Section plane object and tools
 NArchSiteThe Site object and tools
 NArchSpaceThe Space object and tools
 NArchStructureThe Structure object and tools
 NArchTrussThe Truss object and tools
 NArchVRMThe Arch Vector Rendering Module
 NAttacherAttacher.h, Attacher.cpp contain the functionality of deriving placement from a set of geometric subelements
 NAttacherGuiAttacherTexts.h, .cpp - files that contain user-friendly translatable names of attachment modes, as well as help texts, and the like
 NAttachmentEditor
 Nautomotive_design
 NBaseBasic structures used by other FreeCAD components (C++ API)
 NBasicShapesBasicShapes Package for Part workbench
 Nboost_intrusive_has_member_function_callable_with
 NBOPTools
 NClipperLib
 NCloud
 NCloudGui
 NCommands
 Nconfig_control_design
 NData
 NDice3DS
 NDocumentObject
 NDraftFilletProvides Fillet class for objects created with a prototype version
 NDraftGuiGUI elements and utilities of the Draft workbench
 Ndraftguitools
 Ndraftobjects
 Ndrafttaskpanels
 Ndrafttests
 Ndraftutils
 NDraftUtils
 Ndraftviewproviders
 NDrawing
 NDrawingGui
 NDriverGMF
 NexportDRAWEXE
 NexportIFCHelper
 NFeaturePython
 NFem
 Nfemcommands
 Nfemexamples
 NFemGui
 Nfemguiutils
 Nfeminout
 Nfemmesh
 Nfemobjects
 Nfemsolver
 Nfemtaskpanels
 Nfemtest
 Nfemtools