| Foam | Namespace for OpenFOAM | 
| Foam::calcTypes | Namespace for post-processing calculation functions | 
| Foam::combustionModels | |
| Foam::compressibilityModels | Namespace for compressibility models | 
| Foam::compressible | |
| Foam::compressible::LESModels | Namespace for compressible LES models | 
| Foam::compressible::RASModels | Namespace for compressible RAS turbulence models | 
| Foam::compressible::turbulenceModels | Namespace for compressible turbulence turbulence models | 
| Foam::debug | Namespace for handling debugging switches | 
| Foam::energyScalingFunctions | |
| Foam::extrudeModels | |
| Foam::fieldValues | |
| Foam::fileFormats | |
| Foam::functionEntries | Namespace for containing a functionEntry | 
| Foam::fv | Namespace for finite-volume | 
| Foam::fvc | Namespace of functions to calculate explicit derivatives | 
| Foam::fvm | Namespace of functions to calculate implicit derivatives returning a matrix | 
| Foam::helper_ | |
| Foam::incompressible | |
| Foam::incompressible::LESModels | Namespace for incompressible LES models | 
| Foam::incompressible::RASModels | Namespace for incompressible RAS turbulence models | 
| Foam::incompressible::turbulenceModels | Namespace for incompressible turbulence turbulence models | 
| Foam::kineticTheoryModels | |
| Foam::laminarFlameSpeedModels | Namespace for laminar flame speed models | 
| Foam::LESmodels | |
| Foam::limitFuncs | Namespace for limiting functions | 
| Foam::ListListOps | Various utility functions to work on Lists of Lists (usually resulting from 'gather'ing and combining information from individual processors) | 
| Foam::mathematicalConstant | Mathematical constants such as pi, e | 
| Foam::meshReaders | A namespace for holding various types of mesh readers | 
| Foam::meshTools | Collection of static functions to do various simple mesh related things | 
| Foam::meshWriters | A namespace for holding various types of mesh writers | 
| Foam::MULES | Multidimensional universal limiter with explicit solution | 
| Foam::pairPotentials | |
| Foam::pdfs | |
| Foam::PDRDragModels | |
| Foam::phaseChangeTwoPhaseMixtures | |
| Foam::POSIX | OS-specific functions implemented in POSIX | 
| Foam::PstreamGlobals | Global functions and variables for working with parallel streams, but principally for gamma/mpi | 
| Foam::radiation | Namespace for radiation modelling | 
| Foam::resError | Namespace for residual error estimate operators | 
| Foam::sixDoFRigidBodyMotionConstraints | Namespace for six DoF motion constraints | 
| Foam::sixDoFRigidBodyMotionRestraints | Namespace for six DoF motion restraints | 
| Foam::solidBodyMotionFunctions | Namespace for solid-body motions | 
| Foam::SRF | Namespace for single rotating frame (SRF) models | 
| Foam::tetherPotentials | |
| Foam::viscosityModels | A namespace for various incompressible viscosityModel implementations | 
| Foam::XiEqModels | |
| Foam::XiGModels | |
| Foam::XiModels |