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

[detail level 1234]

boost
locale	This is the main namespace that encloses all localization classes
as	This namespace includes all manipulators that can be used on IO streams
boundary	This namespae contains all operations required for boundary analysis of text
conv	Namespace that contains all functions related to character set conversion
flags	This namespace holds additional formatting flags that can be set using ios_info
gnu_gettext	This namespace holds classes that provide GNU Gettext message catalogs support
period	Namespace that contains various types for manipulation with dates
marks	This namespace holds a enum of various period types like era, year, month, etc.
time_zone	Namespace that holds functions for operating with global time zone
utf	Namespace that holds basic operations on UTF encoded sequences
util	This namespace provides various utility function useful for Boost.Locale backends implementations