Here are the classes, structs, unions and interfaces with brief descriptions:

NML_Epetra	ML_Epetra: default namespace for all Epetra interfaces
CCoordPack
CCrsGraphWrapper	ML_Epetra::CrsGraphWrapper: a class to wrap an Epetra_CrsGraph as Epetra_RowMatrix
CEdgeMatrixFreePreconditioner
CIfpack_ML	Wraps an ML preconditioner as an Ifpack_Preconditioner
CMatrixFreePreconditioner	MatrixFreePreconditioner: a class to define preconditioners for Epetra_Operator's
CML_RefMaxwell_11_Operator
CML_RMP
CMultiLevelOperator	MultiLevelOperator: An implementation of the Epetra_Operator class
CMultiLevelPreconditioner	MultiLevelPreconditioner: a class to define black-box multilevel preconditioners using aggregation methods
CRowMatrix	Basic wrapper from ML_Operator to Epetra_RowMatrix
NMLAPI	MLAPI: Default namespace for all MLAPI objects and functions
CBaseLinearCombination
CBaseObject	Basic class for MLAPI objects
CBaseOperator	Base class for all MLAPI objects
CBaseOperatorTimesMultiVector
CCompObject	Class to count flops
CDistributedMatrix
CDoubleVector
CEpetra_SerialMatrix
CEpetraBaseOperator	Basic class to wrap MLAPI::InverseOperator into Epetra_Operator
CInverseOperator	InverseOperator: basic class to define smoother and coarse solvers
CLinearCombinationAdd
CLinearCombinationMixed
CLinearCombinationScaled
CLoadBalanceInverseOperator
CLoadBalanceOperator
CMATLABStream	Basic stream to save in a MATLAB-compatible file MLAPI objects
CML_Operator_Box	Simple wrapper for ML_Operator struct
CMultiLevelAdaptiveSA	Black-box multilevel adaptive smoothed aggregation preconditioner
CMultiLevelSA	Black-box multilevel smoothed aggregation preconditioner
CMultiVector	Basic class for distributed double-precision vectors
CMultiVectorCombination
CMultiVectorScaled
COperator	Operator: basic class to define operators within MLAPI
CResidual
CSerialMatrix
CSpace	Specifies the number and distribution among processes of elements
CStackEntry
CTimeObject	Class to track time spent in an object
Camalg_drop
CEdgeMatrixFreePreconditioner	Matrix-Free preconditioning class for edge Maxwell Problems
CIfpack_ML	Wrapper for Ifpack_Preconditioner
CMatrixFreePreconditioner	ML preconditioner for Matrix-Free operators
CML_agg_indx_comm_struct
CML_Aggregate_Comm_Struct
CML_Aggregate_Struct
CML_Aux_Data
CML_Function_Struct
CML_GetrowFunc_Struct
Cml_matscale
Cml_matvscale
CML_Node_Struct
CML_Operator_Struct
CML_Operator_Subspace_Struct
CML_PrintControl_Struct
CML_RefMaxwell_11_Operator	Epetra_Operator that encapsulates the (1,1) block of the reformulated operator for Maxwell
CML_Struct
CML_SuperNode_Struct
CML_Timing
CMLVec
CMultiLevelPreconditioner	ML black-box preconditioner for Epetra_RowMatrix derived classes
CRefMaxwellPreconditioner	Class for Reformulated Maxwell's Equations solvers. Inherited from ML_Epetra_Operator
CwrappedCommStruct