Here is a list of all namespaces with brief descriptions:

[detail level 12]

▼Nboost
Nprogram_options
NCheckpoints	Block-chain checkpoints are compiled-in sanity checks
NGUIUtil	Utility functions used by the Bitcoin Qt UI
▼Njson_spirit
Ninternal_
▼Nleveldb
Nconfig
Ncrc32c
Nlog
Nport
Ntest
NUi