Here is a list of all namespaces with brief descriptions:

[detail level 1234]

▼Nankerl
►Nnanobench
►Ndetail
CPerfCountSet
CIterationLogic
CPerformanceCounters
Ntemplates
CConfig
CResult
CRng	An extremely fast random generator
CBench	Main entry point to nanobench's benchmarking facility
CBigO
▼NBCLog
CTimer	RAII-style object that outputs timing information to logs
CLogger
Nbech32
▼Nbenchmark
Ndata
CArgs
CBenchRunner
▼NConsensus	Transaction validation functions
CBIP9Deployment	Struct for each individual consensus rule change using BIP9
CParams	Parameters that influence chain consensus
▼NCuckooCache	High-performance cache primitives
Cbit_packed_atomic_flags	bit_packed_atomic_flags implements a container for garbage collection flags that is only thread unsafe on calls to setup
Ccache	cache implements a cache with properties similar to a cuckoo-set
NDBKeys
Ndbwrapper_private	These should be considered an implementation detail of the specific database
Nfeebumper
▼Nfsbridge	Filesystem operations and types
CFileLock
▼NGUIUtil	Utility functions used by the Bitcoin Qt UI
CToolTipToRichTextFilter	Qt event filter that intercepts ToolTipChange events, and replaces the tooltip with a rich text representation if needed
CLabelOutOfFocusEventFilter	Qt event filter that intercepts QEvent::FocusOut events for QLabel objects, and resets their ‘textInteractionFlags’ property to get rid of the visible cursor
CTableViewLastColumnResizingFixer	Makes a QTableView last column feel as if it was being resized from its left border
CClickableLabel
CClickableProgressBar
CItemDelegate
▼Ninterfaces
CFoundBlock	Helper for findBlock to selectively return pieces of block data
►CChain	Interface giving clients (wallet processes, maybe other analysis tools in the future) ability to access to the chain state, receive notifications, estimate fees, and submit transactions
CNotifications	Chain notifications
CChainClient	Interface to let node manage chain clients (wallets, or maybe tools for monitoring and analysis in the future)
CHandler	Generic interface for managing an event handler or callback function registered with another interface
CBlockAndHeaderTipInfo	Block and header tip information
CNode	Top-level interface for a bitcoin node (bitcoind process)
CBlockTip	Block tip (could be a header or not, depends on the subscribed signal)
CWallet	Interface for accessing a wallet
CWalletClient	Wallet chain client that in addition to having chain client methods for starting up, shutting down, and registering RPCs, also has additional methods (called by the GUI) to load and create wallets
CWalletAddress	Information about one wallet address
CWalletBalances	Collection of wallet balances
CWalletTx
CWalletTxStatus	Updated transaction status
CWalletTxOut	Wallet transaction output
▼Nmemusage
Cstl_tree_node
Cstl_shared_counter
Cunordered_node
NNetMsgType	Bitcoin protocol message types
Nripemd160	Internal RIPEMD-160 implementation
NRPCServer
Nsha1	Internal SHA-1 implementation
Nsha256	Internal SHA-256 implementation
Nsha256_shani
Nsha256d64_avx2
Nsha256d64_shani
Nsha256d64_sse41
Nsha512	Internal SHA-512 implementation
Nspanparsing
▼Ntinyformat
►Ndetail
►Cis_convertible
Cfail
Csucceed
Cis_wchar
Cis_wchar< wchar_t * >
Cis_wchar< const wchar_t * >
Cis_wchar< const wchar_t[n]>
Cis_wchar< wchar_t[n]>
CformatValueAsType
CformatValueAsType< T, fmtT, true >
CconvertToInt
CconvertToInt< T, true >
CFormatArg
CFormatListN
CFormatListN< 0 >
Cformat_error
CFormatList	List of template arguments format(), held in a type-opaque way
Ntorv3
▼NUi
CAddressBookPage
CAskPassphraseDialog
CCoinControlDialog
CCreateWalletDialog
CRPCConsole
CEditAddressDialog
CHelpMessageDialog
CIntro
CModalOverlay
COpenURIDialog
COptionsDialog
COverviewPage
CPSBTOperationsDialog
CReceiveCoinsDialog
CReceiveRequestDialog
CSendCoinsDialog
CSendCoinsEntry
CSignVerifyMessageDialog
CTransactionDescDialog
▼Nutil
CRef	Type-safe dynamic reference
CSettings	Stored settings
CSettingsSpan	Accessor for list of settings that skips negated values when iterated over
Nwallet_crypto_tests
NWalletTool