| ACDCGenerator | The namespace in which all ACDCGen classes are defined |
| LWH | The LWH namespace contains a Light-Weight Histogram package which implements the most rudimentary histogramming facilities according to the AIDA interface specifications |
| ThePEG | This is the main namespace within which all identifiers in ThePEG are declared |
| ThePEG::Constants | The Constants namespace containing some useful physical constants with suitable units |
| ThePEG::Group | Namespace to encapsulate enums related to HandlerGroups |
| ThePEG::Helicity | The Helicity namespace contains classes for spin representation classes in ThePEG |
| ThePEG::Helicity::VertexType | Namespace for naming of vertices |
| ThePEG::Interface | The Interface namespace declares a number of enums to set options for subclasses of InteracedBase |
| ThePEG::Math | The Math namespace includes the declaration of some useful mathematical functions |
| ThePEG::Math::Functions | This namespace introduces some useful function classes with known primitive and inverse primitive functions |
| ThePEG::ParticleID | The ParticleID namespace defines the ParticleCodes enumeration |
| ThePEG::Pointer | The namespace for the reference counted pointer classes |
| ThePEG::UnitRemoval | Use symbols from this namespace to make forced breaks of unit consistency explicit |
| ThePEG::Units | The Units namespace contains the declaration of a number of classes for variables with dimension |
1.5.5