Here is a list of all namespaces with brief descriptions:

[detail level 123]

__impl
accountXML
AIEvents
AiXml
anonymous_namespace{autodocking.cpp}
anonymous_namespace{bubble_display.cpp}
anonymous_namespace{plane_display.cpp}
anonymous_namespace{sensor.cpp}
anonymous_namespace{sphere_display.cpp}
Audio
__impl
OpenAL
Test
BaseUtil
BeamXML
BriefingUtil
CAR
CockpitKeys
CockpitXML
CommXML
config
ConsoleKeys
CS
default_result_converter
defs
FactionUtil
FactionXML
FFMpeg
fg_util
FileUtil
GalaxyXML
GFXMatrices
InitializationFunctors
Muzak
NebulaXML
Opcode
OpenGLL
Orders
Radar
replaceall
ROLES
SaveNetUtil
StarSystemGent
StarXML
stdext
TerrainXML
UnitUtil
UnitXML
UniverseUtil
vsalg
VSFileSystem
VsnetDownload
Adapter
Client
Server
VsnetOSS
XMLDOM
ExpatHandlers
XMLSupport