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

[detail level 123]

NOpm	This file contains a set of helper functions used by VFPProd / VFPInj
NProperties
NTTag	The generic type tag for problems using the immiscible multi-phase model
NDetail	Implementation details for template meta programming
NDamarisOutput	Below are the Damaris Keywords supported by Damaris to be filled in the built-in XML file
NEQUIL	Types and routines that collectively implement a basic ECLIPSE-style equilibration-based initialisation scheme
NMiscibility	Types and routines relating to phase mixing in equilibration calculations
Ngpuistl	A small, fixed‑dimension MiniVector class backed by std::array that can be used in both host and CUDA device code
Ndetail	Contains wrappers to make the CuBLAS library behave as a modern C++ library with function overlading
NHypreInterface	Unified interface for Hypre operations with both CPU and GPU data structures
NExceptionType	This class implements a deferred logger: 1) messages can be pushed back to a vector 2) a call to logMessages adds the messages to OpmLog backends
NRegionAttributeHelpers
NSelect	Convenience tools for processing region spesific attributes