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The full FreeCAD source tree has many other branches, but most Contributors will only need to deal with these:
graph LR
A[src] --- B[App: Documents, DocumentObjects, EventPropagation]
A --- C[Base: FundamentalTypes, Utilities]
A --- D[Gui: Windows, Menus, Dialogs]
A --- E[Mod: ApplicationLogic]
subgraph Mod: ApplicationLogic
E[Mod] --- F[Arch: Buildings]
E --- G[Draft: 2DDesign]
E --- H[Part: BasicShapes, BooleanOps]
E --- I["..."]
end