Here is a list of all namespaces with brief descriptions:

[detail level 1234567]

ConciergeServer
LaunchSLClient
Properties
Nwc
XmlRpc
OdeAPI
OpenMetaverse
OpenSim
ApplicationPlugins
LoadRegions
RegionModulesController
RemoteController
Capabilities
Handlers
FetchInventory
Tests
ConsoleClient
Data
MySQL
Null
PGSQL
SQLite
Tests
Framework
AssetLoader
Filesystem	Loads assets from the filesystem location. Not yet a plugin, though it should be.
Capabilities
Client
Console
Monitoring
Interfaces
Serialization
External
Tests
Servers
HttpServer
Tests
ServiceAuth
Tests
Groups
OfflineIM
Region
ClientStack
Linden
Caps
Tests
Tests
LindenCaps
LindenUDP
Tests
CoreModules
Agent
AssetTransaction
IPBan
TextureSender
Xfer
Asset
Tests
Avatar
Attachments
Tests
AvatarFactory
BakedTextures
Chat
Tests
Combat
CombatModule
Dialog
Friends
Tests
Gestures
Gods
Groups
InstantMessage
Inventory
Archiver
Tests
Transfer
Tests
Lure
Profile
UserProfiles
Avatars
Commands
Framework
DynamicAttributes
DAExampleModule
EntityTransfer
InterfaceCommander
InventoryAccess
Tests
Library
Monitoring
Alerts
Monitors
Search
Statistics
Logging
UserManagement
Tests
Hypergrid
Scripting
DynamicTexture
EmailModules
HttpRequest
Tests
LoadImageURL
LSLHttp
ScriptModuleComms
VectorRender
Tests
WorldComm
XMLRPC
ServiceConnectorsIn
Asset
Authentication
Freeswitch
Grid
Hypergrid
Inventory
Land
Login
MapImage
Neighbour
Simulation
ServiceConnectorsOut
AgentPreferences
Asset
Tests
Authentication
Authorization
Avatar
Grid
Tests
GridUser
Inventory
Land
MapImage
Neighbour
Presence
Tests
Profile
Simulation
UserAccounts
Terrain
Tests
World
Archiver
Tests
Estate
Land
Tests
LegacyMap
LightShare
Media
Moap
Tests
Objects
BuySell
Commands
Permissions
Region
Serialiser
Tests
Sound
Terrain
Effects
FileLoaders
FloodBrushes
Modifiers
PaintBrushes
Tests
Vegetation
Warp3DMap
Wind
Plugins
WorldMap
DataSnapshot
Interfaces
Providers
Framework
DynamicAttributes
DOExampleModule
Interfaces
Scenes
Animation
Scripting
Serialization
Tests
Types
Tests
OptionalModules
Agent
InternetRelayClientView
Server
TextureSender
Asset
Avatar
Animations
Appearance
Attachments
Chat
Concierge
Friends
SitStand
Voice
FreeSwitchVoice
VivoxVoice
XmlRpcGroups
Tests
Example
BareBonesNonShared
BareBonesShared
Framework
Monitoring
Materials
PhysicsParameters
Scripting
JsonStore
Tests
Minimodule
Interfaces
Object
WorldX
ObjectModules
RegionReady
XmlRpcGridRouterModule
XmlRpcRouterModule
UDP
Linden
ViewerSupport
WebSocketEchoModule
World
AutoBackup
MoneyModule
NPC
Tests
TreePopulator
WorldView
PhysicsModule
BasicPhysics
BulletS
Tests
Meshing
ODE
Tests
POS
ubOde
ubODEMeshing
PhysicsModules
ConvexDecompositionDotNet
SharedBase
RegionCombinerModule
ScriptEngine
Interfaces
Shared
Api
Interfaces
Plugins
Runtime
CodeTools
Tests
Instance
Tests
ScriptBase
Tests
Tests
XEngine
ScriptBase
Tests
UserStatistics
Server
Base
Handlers
AgentPreferences
Asset
Test
Authentication
Authorization
Avatar
BakedTextures
Base
Freeswitch
Friends
Grid
GridUser
Hypergrid
Inventory
Land
Login
MapImage
Neighbour
Presence
Profiles
Simulation
UserAccounts
Services
AssetService
AuthenticationService
AuthorizationService
AvatarService
Base
Connectors
Friends
Hypergrid
InstantMessage
SimianGrid
Simulation
EstateService
FreeswitchService
Friends
FSAssetService
GridService
HypergridService
Interfaces
InventoryService
Tests
LLLoginService
MapImageService
PresenceService
ProfilesService
SimulationService
UserAccountService
UserProfilesService
Tests
Clients
AssetsClient
GridClient
Common
Performance
Stress
Tools
Configger
LSL
Compiler
pCampBot
Interfaces
PrimMesher
Robust
Tests