Here is a list of all namespaces with brief descriptions:

boost
boost::details
boost::gil
boost::gil::detail
boost::gil::hsl_color_space
boost::gil::hsv_color_space
boost::gil::lab_color_space
boost::gil::toolbox
boost::gil::xyz_color_space
boost::stack_trace
Ctl
Ctl::Interpreter
dpx	OpenDPX namespace
layer
OFX	The core 'OFX Support' namespace, used by plugin implementations. All code for these are defined in the common support libraries
OFX::Exception	Namespace for OFX support lib exceptions, all derive from std::exception, calling it
OFX::Log	This namespace wraps up logging functionality
OFX::memory	Namespace for general purpose memory allocation
OFX::Message
OFX::MultiThread	Multi thread namespace
OFX::Plugin	The OFX::Plugin namespace. All the functions in here needs to be defined by each plugin that uses the support libs
OFX::Private	OFX::Private namespace, for things private to the support library code here generally calls image effect class members
OFX::Validation	The validation code has its own namespace
sam
sam::samdo
sequenceParser
sequenceParser::detail
sobel
std
terry
terry::algorithm
terry::algorithm::ext_detail
terry::color
terry::color::cmyk_colorspace
terry::color::components
terry::color::gradation	All supported gradations
terry::color::hsl_colorspace
terry::color::layout
terry::color::layout::cmyk
terry::color::layout::hsl
terry::color::layout::hsv
terry::color::layout::lab
terry::color::layout::luv
terry::color::layout::rgb
terry::color::layout::XYZ
terry::color::layout::YPbPr
terry::color::layout::yuv
terry::color::layout::Yxy
terry::color::lms_colorspace
terry::color::primaries	All supported primaries
terry::color::rgb_colorspace
terry::color::temperature
terry::color::transfer
terry::color::transfer::detail
terry::color::xyz_colorspace
terry::detail
terry::detail_copy_channel
terry::draw
terry::filter
terry::filter::detail
terry::filter::floodFill
terry::filter::thinning
terry::generator
terry::geometry
terry::math
terry::numeric
terry::sampler
terry::sampler::details
tuttle	This file provides a set of reimplementations of CImg functions by means of the generic image library (gil). Functions for image blurring
tuttle::common
tuttle::common::details
tuttle::common::formatters
tuttle::exception
tuttle::host	Library for host
tuttle::host::attribute
tuttle::host::core	All main class of the host
tuttle::host::exception
tuttle::host::graph	Graph work
tuttle::host::graph::detail
tuttle::host::graph::visitor
tuttle::host::memory
tuttle::host::ofx	OpenFX wrapping to communicate with C API
tuttle::host::ofx::APICache
tuttle::host::ofx::attribute
tuttle::host::ofx::imageEffect
tuttle::host::ofx::interact
tuttle::host::ofx::property
tuttle::imageUtils
tuttle::io
tuttle::ofx
tuttle::ofx::imageEffect
tuttle::plugin
tuttle::plugin::anisotropicFilter
tuttle::plugin::anisotropicFilter::diffusion
tuttle::plugin::anisotropicFilter::tensors
tuttle::plugin::av
tuttle::plugin::av::reader
tuttle::plugin::av::writer
tuttle::plugin::basicKeyer
tuttle::plugin::bitDepth
tuttle::plugin::blur
tuttle::plugin::checkerboard
tuttle::plugin::color
tuttle::plugin::color::ColourTemp
tuttle::plugin::color::GradationLaw
tuttle::plugin::color::Layout
tuttle::plugin::color::Premultiplication
tuttle::plugin::color::Primaries
tuttle::plugin::colorBars
tuttle::plugin::colorCube
tuttle::plugin::colorCubeViewer
tuttle::plugin::colorGradation
tuttle::plugin::colorGradient
tuttle::plugin::colorspace
tuttle::plugin::colorSpaceKeyer
tuttle::plugin::colorSuppress
tuttle::plugin::colorTransfer
tuttle::plugin::colorTransform
tuttle::plugin::colorWheel
tuttle::plugin::component
tuttle::plugin::constant
tuttle::plugin::convolution
tuttle::plugin::crop
tuttle::plugin::ctl
tuttle::plugin::debugImageEffectApi
tuttle::plugin::dpx
tuttle::plugin::dpx::reader
tuttle::plugin::dpx::writer
tuttle::plugin::dummy
tuttle::plugin::exception
tuttle::plugin::exr
tuttle::plugin::exr::reader
tuttle::plugin::exr::writer
tuttle::plugin::fade
tuttle::plugin::flip
tuttle::plugin::floodFill
tuttle::plugin::gamma
tuttle::plugin::histogram
tuttle::plugin::histogramKeyer
tuttle::plugin::idKeyer
tuttle::plugin::imagemagick
tuttle::plugin::imagemagick::reader
tuttle::plugin::imagemagick::writer
tuttle::plugin::imageStatistics
tuttle::plugin::imageUtils
tuttle::plugin::inputBuffer
tuttle::plugin::interact
tuttle::plugin::invert
tuttle::plugin::jpeg
tuttle::plugin::jpeg2000
tuttle::plugin::jpeg2000::reader
tuttle::plugin::jpeg2000::writer
tuttle::plugin::jpeg::reader
tuttle::plugin::jpeg::writer
tuttle::plugin::lens
tuttle::plugin::localmaxima
tuttle::plugin::lut
tuttle::plugin::mathOperator
tuttle::plugin::memoryBuffer
tuttle::plugin::merge
tuttle::plugin::move2D
tuttle::plugin::nlmDenoiser
tuttle::plugin::normalize
tuttle::plugin::ocio
tuttle::plugin::ocio::colorspace
tuttle::plugin::ocio::lut
tuttle::plugin::openImageIO
tuttle::plugin::openImageIO::reader
tuttle::plugin::openImageIO::writer
tuttle::plugin::outputBuffer
tuttle::plugin::overlay
tuttle::plugin::pinning
tuttle::plugin::png
tuttle::plugin::png::reader
tuttle::plugin::png::writer
tuttle::plugin::print
tuttle::plugin::pushPixel
tuttle::plugin::quality
tuttle::plugin::ramp
tuttle::plugin::raw
tuttle::plugin::raw::reader
tuttle::plugin::resize
tuttle::plugin::seExpr
tuttle::plugin::sobel
tuttle::plugin::swscale
tuttle::plugin::text
tuttle::plugin::thinning
tuttle::plugin::timeShift
tuttle::plugin::turboJpeg
tuttle::plugin::turboJpeg::reader
tuttle::plugin::turboJpeg::writer
tuttle::plugin::viewer
tuttle::plugin::warp
tuttle::plugin::warp::bezier
tuttle::plugins	Library for plugins
tuttle::test