Here is a list of all documented files with brief descriptions:

src-fem
Galeri_AbstractProblem.h
Galeri_AbstractQuadrature.h
Galeri_AbstractVariational.h
Galeri_GalerkinVariational.h
Galeri_HexCubeGrid.h
Galeri_HexQuadrature.h
Galeri_LinearProblem.h
Galeri_QuadQuadrature.h
Galeri_QuadRectangleGrid.h
Galeri_TetCubeGrid.h
Galeri_TetQuadrature.h
Galeri_TriangleQuadrature.h
Galeri_Workspace.h
src-pfem
Galeri_core_Object.h
Galeri_grid_Element.h	Base class for all grid elements
Galeri_grid_Hex.h	Class for grid hexahedra
Galeri_grid_Loadable.h	A flexible grid data structure container for distributed problems
Galeri_grid_Point.h	Class for grid points
Galeri_grid_Quad.h	Class for grid quadrilaterals
Galeri_grid_Segment.h	Class for grid segment
Galeri_grid_Tet.h	Class for grid tetrahedra
Galeri_grid_Triangle.h	Class for grid triangles