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

[detail level 1234]

Nfpsdk	Fixposition SDK
Ncommon	Fixposition SDK: Common library
Napp	Utilities for apps
Ncam	Camera types and utilities
Ncan	CAN bus utilities
Nfpl	.fpl utilities
Ngnss	GNSS types and utilities
Nlogging	Logging
Nmath	Math utilities
Nparser	Parser
Ncrc	Parser NOV_B routines and types
Nfpa	Parser FP_A routines and types
Nfpb	Parser FP_B routines and types
Nnmea	Parser NMEA routines and types
Nnovb	Parser NOV_B routines and types
Nqgc	Parser QGC routines and types
Nrtcm3	Parser RTCM3 routines and types
Nsbf	Parser SBF routines and types
Nspartn	Parser SPARTN routines and types
Nubx	Parser UBX routines and types
Nunib	Parser UNI_B routines and types
Npath	File and path utilities
Nros1	ROS1 types and utils
Nros2	ROS2 types and utils
Nstring	String utilities
Nthread	Thread helpers
Ntime	Time utilities
Ntrafo	Transformation utilities
Ntypes	Common types
Nutils	Utilities
Nvideo	Video frame decoding
Nyaml	YAML utilities
Napps	Fixposition SDK: Apps
Nfpltool	Fpltool
Nparsertool	Parsertool
Ntimeconv	Timeconv
Ntimetool	Timetool
Nstreammux	Streammux