Boost :

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:Author: Yigong Liu
:Review Manager: Needed
:Download: http://channel.sourceforge.net/
:Description: Join is an asynchronous, message based C++ concurrency
  library based on join calculus. It is applicable both to
  multi-threaded applications and to the orchestration of asynchronous,
  event-based applications. It follows Comega's design and
  implementation and builds with Boost facilities. It provides a high
  level concurrency API with asynchronous methods, synchronous methods,
  and chords which are "join-patterns" defining the synchronization,
  asynchrony, and concurrency.
Pimpl
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:Author: Vladimir Batov
:Review Manager: Needed
:Download: | `Boost Vault <http://www.boost-consulting.com/vault/index.php?action=downloadfile&amp;filename=Pimpl.zip&amp;directory=&amp;>`__
           | http://www.ddj.com/cpp/205918714 (documentation)
:Description: The Pimpl idiom is a simple yet robust technique to
  minimize coupling via the separation of interface and implementation
  and then implementation hiding.   This library provides a convenient
  yet flexible and generic deployment technique for the Pimpl idiom.
  It's seemingly complete and broadly applicable, yet minimal, simple
  and pleasant to use.
Sorting
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:Author: Steven Ross
:Review Manager: Needed
:Download: `Boost Vault <http://www.boostpro.com/vault/index.php?action=downloadfile&amp;filename=algorithm_sorting.zip>`__
:Description:
 A grouping of 3 templated hybrid radix/comparison-based sorting
 algorithms that provide superior worst-case and average-case
 performance to std::sort: integer_sort, which sorts fixed-size data
 types that support a rightshift (default of >>) and a comparison
 (default of <) operator.   float_sort, which sorts standard
 floating-point numbers by safely casting them to integers.
 string_sort, which sorts variable-length data types, and is optimized
 for 8-bit character strings.
 All 3 algorithms have O(n(k/s + s)) runtime where k is the number of
 bits in the data type and s is a constant, and limited memory overhead
 (in the kB for realistic inputs).   In testing, integer_sort varies
 from 35% faster to 2X as fast as std::sort, depending on processor,
 compiler optimizations, and data distribution.   float_sort is roughly
 70% faster than std::sort.   string_sort is roughly 2X
 as fast as std::sort.
Quaternions, Vectors, Matrices
------------------------------
:Author: Emil Dotchevski
:Review Manager: Needed
:Download: http://www.revergestudios.com/boost-qvm/
:Description: QVM defines a set of generic functions and
    operator overloads for working with quaternions, vectors and matrices
    of static size. The library also defines vector and matrix data types,
    however it allows users to introduce their own types by specializing
    the q_traits, v_traits and m_traits templates.
Variadic Macro Data
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:Author: Edward Diener
:Review Manager: Needed
:Download: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/variadic_macro_data/>`__
:Description:
  The variadic_macro_data library adds support and functionality for
  variadic macros to Boost as well as integrating variadic macros with
  the Boost PP library without changing the latter library in any way.
Block Pointer
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:Author: Phil Bouchard
:Review Manager: Needed
:Download: `Boost Sandbox <https://svn.boost.org/svn/boost/sandbox/block_ptr/>`__
:Description: Deterministic memory manager of constant complexity capable of
  handling cyclic collections.
Network
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:Author: Dean Michael Berris
:Review Manager: Needed
:Download: http://cplusplus-soup.com/2011/04/18/cpp-netlib-0-9-0-released/
:Description: This is a library that provides application layer
  protocol support using modern C++ techniques. It is light-weight,
  fast, cross-platform and is intended to be as easy to configure as
  possible.
Singularity
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:Author: Ben Robinson
:Review Manager: Needed
:Download: https://github.com/icaretaker/Singularity
:Description: The Singularity Design Pattern allows you to restrict
  any class to a single instance. Unlike the infamous Singleton,
  Singularity gives you direct control over the lifetime of the object,
  does not require you to grant global access to the object, nor does it
  limit you to the default constructor for that object.
Predef
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:Author: Rene Rivera
:Review Manager: Needed
:Download: http://tinyurl.com/73n6a3k
:Description: The Predef library implements two simple tasks:
  1. Definition of a single version number macro to provide consistent
  version number at the preprocessor level.
  2. A collection of detected definitions for compilers, standard
  libraries, architectures, operating systems, and languages.
  Unlike the Boost Config Library it doesn't define language features
  and capabilities. But only defines presence of detected compilation
  context. Documentation and downloads are available in the sandbox..
Libraries under development
===========================
See http://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction
for a current listing of libraries under development.