ACDK - Artefaktur Component Development Kit
   Platform independent C++ component framework similar to Java or .NET (reflection, threading, Unicode, garbage collection, io, net, util, xml, etc.) with integration of Java, Perl, Python, Tcl, Lisp, COM and CORBA. [Open source, LGPL or Qt Public License]
   http://acdk.sourceforge.net/

Adevs (A Discrete EVent System simulator)
   A C++ library for constructing discrete event simulations based on the Parallel DEVS and Dynamic DEVS (dynDEVS) formalisms.
   http://www.ece.arizona.edu/~nutaro/

Apache C++ Standard Library
   The goal is to provide a free implementation of the ISO/IEC 14882 international standard for C++ that enables source code portability and consistent behavior of programs across all major hardware implementations, operating systems, and compilers, open sou
   http://incubator.apache.org/stdcxx/

Available C++ Libraries FAQ
   Contains a list of available C++ libraries, both public domain and commercial.
   http://www.faqs.org/faqs/C++-faq/libraries/

Babylon Library
   A collection of simple routines and classes that could be used as building blocks of larger projects. Many of the methods are portable and adjusted for use in embedded systems. [Open source, Artistic License]
   http://www.commonsoftinc.com/Babylon_Cpp/

Bioinformatics Template Library (BTL)
   Provides the generic mathematical components that will allow programmers to more rapidly construct applications that model biological entities.
   http://people.cryst.bbk.ac.uk/~classlib/bioinf/BTL99.html

BitMagic
   A C++ classes library implementing bitvectors with several types of on-the-fly, adaptive compression. Can be used in databases and search systems. [Open source, MIT License]
   http://bmagic.sourceforge.net/

BuDDy
   An efficient and simple to use Binary Decision Diagram (ROBDD) package for C and C++.
   http://sourceforge.net/projects/buddy

C++ Portable Types Library (PTypes)
   A simple alternative to the STL plus portable multithreading and networking. Compiles under modern Unix and Windows systems. [Open-source, zlib-like license]
   http://www.melikyan.com/ptypes/

C++ Str Library
   String and character manipulation library for Windows and various gcc-supported platforms. Provides highly optimized code, with support for multithreaded environments and Unicode. Regular expressions support. [Shareware, full-featured evaluation version w
   http://www.utilitycode.com/str/

C++ Threads
   The aim of this library is to provide the programmer with an easy to use class, that can be further inherited to provide a rich set of threaded functionality rarely seen in a Linux environment.
   http://threads.sourceforge.net/

C++SIM
   An object-oriented simulation package written in C++. It provides discrete event process-based simulation similar to SIMULA's simulation class and libraries.
   http://cxxsim.ncl.ac.uk/

CGAL - Computational Geometry Algorithms Library
   A collaborative effort to develop a robust, easy to use, and efficient C++ software library of geometric data structures and algorithms.
   http://www.cgal.org/

Chilkat C++ Libraries
   A static libraries for Visual C++ and C++ Builder developers: zip, e-mail, encryption, S/MIME, XML.[Shareware]
   http://www.chilkatsoft.com/cpp_libraries.asp

CodeCogs
   An open source numerical library for mathematician, engineers and scientists who work in C++. Users can donate or licence (for commercial uses) their own code, request components, or bid to develop requested components.
   http://www.codecogs.com

Codemesh JMS Courier
   Lets you integrate C++ into any Java Message Service (JMS) vendor environment. [Commercial]
   http://codemesh.com/products/jmscourier/

Common C++
   A framework offering portable support for threading, sockets, file access, deamons, persistance, and system for clarity, services. [Open Source, GPL]
   http://cplusplus.sourceforge.net/

Common Text Transformation Library
   Library of C++ classes and functions to parse and modify STL strings. CTTL substring classes may be compared, inserted, replaced, and parsed with EBNF grammars. Compiled program implements recursive descent LL(INF) parser. [Open source, GPL]
   http://cttl.sourceforge.net/

Cross-Platform Toolkit Library (xtklib)
   A complete C++ based framework for object-oriented cross-platform programming. [Open Source]
   http://xtklib.sourceforge.net/

Crypto++
   Free library of cryptographic schemes: includes ciphers, message authentication codes, one-way hash functions, public-key cryptosystems, and key agreement schemes.
   http://www.cryptopp.com/

DateLib
   Platform independent C/C++ library for date and time calendric calculations. (by Hofmann Software Engineering International)
   http://www.datelib.de/index.shtml.en

ET++
   Official distribution site of application framework class library.
   http://www.gup.uni-linz.ac.at/research/debugging/distribution/et++.html

Ebsotech IX SDK
   A cross-platform C/C++ library provides systems developers with the possibility to develop localized applications for robust data processing simultaneously for several target environments and language areas. Memory and process management, thread locking a
   http://www.ebsotech.com

FC++: The Functional C++ Library
   Provides higher-order polymorphic functions in the C++ language.
   http://www-static.cc.gatech.edu/~yannis/fc++/

FOX Toolkit
   A free, cross-platform C++ GUI library. It features an event messaging and targeting scheme with a very clean, factored, OS-abstracted design. [Open Source, LGPL]
   http://www.fox-toolkit.org/

GNU Aspell
   A library providing spell checking. [Open source, LGPL]
   http://aspell.net/

GNU Nana
   Library of many tested, proven methods to raise reliability of C & C++ code. Includes: extended logging, assertion checking, Design by Contract: DbC. Supports realtime measurements, making performance statistics for code fragments, and tracing program
   http://www.gnu.org/software/nana/nana.html

GTK--
   C++ interfaces and bindings for GTK+
   http://gtkmm.sourceforge.net/

Innodyne Corp.
   Provides OTS MIL-STD-2045 47001B/C, VMF and MIL-STD-6040 USMTF encoder decoders as OS and platform independent C++ libaraies.
   http://www.innodynecorp.com

InteLib: Lisp programming within a C++ project
   A class library for Lisp programming within a C++ project using existing C++ translators. [Open source, GPL]
   http://www.intelib.org/

Inti
   Integrated C++ Foundation Libraries, including Inti::GTK, a C++ GTK+ binding (No longer an active project).
   http://sources.redhat.com/inti/

JUCE
   A C++ toolkit providing a complete set of fundamental classes for building applications for Windows/MacOSX/Linux. It covers GUIs, containers, audio, midi, XML, vector graphics, file/network handling. [Open source, GPL or commercial license]
   http://www.rawmaterialsoftware.com/juce/

LEDA
   Library of Efficient Data types and Algorithms. Has all relevant algorithm building blocks in easy-to-use, efficient form for objects such as graphs, sequences, dictionaries, trees, points, flows, matchings, segments, shortest paths. [Algorithmic Solution
   http://www.algorithmic-solutions.com/enleda.htm

LFC
   A general C++ class library/framework. [Open Source, LGPL]
   http://lfc.sourceforge.net/

Led Rich Text C++ Class Library
   A portable, cross-platform C++ library designed to add various kinds of word processing (rich text) or text editing capabilities to your application.
   http://www.sophists.com/Led/LedClassLib/

Libsigc++
   Implements a full callback system for use in widget libraries, abstract interfaces, and general programming. [LGPL]
   http://libsigc.sourceforge.net/

Mersenne Twister
   Freeware C++ implementation of the famous Mersenne Twister pseudo-random number generator algorithm, known as one of the best generators, with a period of 2^19937-1. Written in 100% standard ISO C++, free to use.
   http://www.bedaux.net/mtrand/

Neatcpp.com
   C++ class libraries for Windows with source code. [Free and commercial]
   http://neatcpp.com

ORBit-C++
   C++ bindings for ORBit.
   http://orbitcpp.sourceforge.net/

OSE
   Generic application framework suitable for constructing general purpose applications, distributed systems and web based services.
   http://ose.sourceforge.net/

Object Oriented Template Library (OOTL) for C++
   A C++ library which provides object oriented alternatives to C++ primitives and the STL collections. [Open source, Boost license]
   http://www.ootl.org/

Odin Plus Plus (OPP)
   Includes base class components, collections, I/O classes, network and Internet classes, object database support, and thread library.
   http://www.odin-consulting.com/OPP/

Open EzBasic
   A C++ based library, that can be used to make programs using functions as in VB. The library has 25 classes ranging from GUI, Threads, String, Active-X. Simple way to convert VB code to C++. [Open source, Qt Public License (QPL)]
   http://ezbasic.sourceforge.net

OpenSprings
   A set of C++ libraries to speed development and extend application capability. [Open source, GPL]
   http://sourceforge.net/projects/opensprings/

OpenTop C++ Library
   A cross-platform C++ library providing high-performance and portable classes for multi-threading, I/O, networking, Unicode and XML parsing. [Commercial]
   http://www.elcel.com/products/opentop/

P::Classes
   A high performance C++ application framework which provides many classes needed for real-world application development, emphasing on ease of use, size and stability. [Open Source, LGPL]
   http://pclasses.sourceforge.net

POST++
   Provides a simple persistent storage, making objects persistent with no overhead on accessing them at runtime.
   http://www.ispras.ru/~knizhnik/post.html

ParaTek
   A C++ toolkit which enables developers to created distributed peer to peer solutions using agent engineering.
   http://www.paratek.co.uk/

Presentation on The Bioinformatics Template Library (BTL)
   Documentation and Online-Presentations about STL and generic programming.
   http://people.cryst.bbk.ac.uk/~classlib/EBI_poster/

Reason C++ Framework
   A cross platform C++ framework with support for sockets, files, streams, encoding, compression, encryption, threading, times/dates, networking, URLs, http, XML, XPath, collections, generics and databases.
   http://reasoning.info

Reflex - Reflection for C++
   A non-intrusive enhancement of C++ to add runtime reflection capabilities. [Open source, LGPL]
   http://seal-reflex.web.cern.ch/seal-reflex/

RudeServer C++ Libraries
   C++ CGI Parser, C++Config File, C++ Socket, C++ Database libraries. [Commercial]
   http://www.rudeserver.com/

SID
   A framework for building computer system simulations. Specifically, a simulation is comprised of a collection of loosely coupled components. Simulated systems may range from a CPU's instruction set to a large multi-processor embedded system. [Open source,
   http://sources.redhat.com/sid/

SOL++2000
   a free C++ class library for Microsoft Windows. All source files of the library and a lot of sample programs are available.
   http://home.att.ne.jp/green/atlan/

STLSoft
   Provides freely available STL-like extensions, including STL-style wrappers for common operating system and framework APIs (such as Windows, Unix, COM, MFC, ATL).
   http://synesis.com.au/software/stlsoft/

STXXL
   An implementation of the C++ standard template library STL for external memory (out-of-core) computations, containers and algorithms that can process huge volumes of data that only fit on disks. [Open source, GPL]
   http://stxxl.sourceforge.net/

Script Plus Plus library
   C++ class library which provides a partially-compatible replacement for the well-known string class, which is capable in the most popular operations on strings such as breaking down to words/tokens, conversion to numbers. [Open source, LGPL]
   http://www.croco.net/software/scriptpp

SimSys
   A programming framework for simulating digital logic. [Open Source]
   http://www.diku.dk/hjemmesider/studerende/schier/simsyshome.html

SourcePro C++
   A set of cross-platform C++ development components complete with documentation, source code and support. The set of four SourcePro components are: SourcePro Core, SourcePro DB, SourcePro Net, and SourcePro Analysis.
   http://www.roguewave.com/sourcepro/sourcepro.cfm

Standard J2K Library
   A completely portable C++ library, to provide a standard set of classes similar to Java Common API. [Open Source, LGPL]
   http://j2k.sourceforge.net/

StreamModule
   Library designed to simplify writing distributed programs. Instead of attempting to hide asynchronous behavior behind a synchronous facade, it attempts to make it easier to write programs that deal with asynchronous behavior.
   http://www.omnifarious.org/StrMod/

The Available C++ Libraries FAQ
   Listing with descriptions of a large number of C++ libraries, both commercial and free.
   http://www.trumphurst.com/cpplibs1.html

The Boost Graph Library (BGL)
   General purpose, generic C++ library for graph data structures and graph algorithms.
   http://www.boost.org/libs/graph/doc/

The C++ Portable Components
   Class libraries for developing network-centric, portable applications in C++. The classes cover functionality like threads, thread synchronization, filesystem access, streams, shared libraries and class loading, sockets and network protocols, as well as a
   http://www.appinf.com/poco/

Ultimate++
   A C++ cross-platform rapid application development suite. It includes a set of libraries (GUI, SQL, etc..), and an integrated development environment with GUI designer, debugger, etc.
   http://www.ultimatepp.org/

VDKBuilder
   A C++ wrapper to GTK+. It base on VDK, the Visual Development Kit. [Open source, GPL]
   http://home.planet.nl/~groe2579/vdkbuilder/

VXL (the Vision-something-Libraries)
   A collection of C++ libraries designed for computer vision research. Includes imaging, geometry, numerics, streaming I/O, basic templates, posix. VXL is written in ANSI/ISO C++ and is designed to be portable over many platforms.
   http://vxl.sourceforge.net/

Visibility for C++
   Visualizing C++ object systems in real-time. Supports the visualization of all the fundamental C++ data types. Enables dynamic GUI's (Graphical User Interfaces) to be created without the need for a single line of UI code. By Outerface Technologies Inc.
   http://www.outerface.com/

XParam
   Parameter handling library. Extendable, type-safe, non-intrusive, object-oriented tool for general-purpose object serialization in C++. Good for parsing command-line parameters, cross-program and cross-platform communication, object streams, and as a plug
   http://xparam.sourceforge.net/

ZThreads
   An advanced object-oriented, cross-platform C++ threading and synchronization library. [GPL]
   http://zthread.sourceforge.net/

Zinc
   Provides a portable and international framework for the development of high performance, mission critical applications.
   http://www.windriver.com/products/zinc_for_desktop/

dlib C++ library
   A collection of various classes. Sockets, threading, GUI, and directory browsing API. Also many container classes and other miscellaneous items such as a big integer and lossless data compression objects. [Open source]
   http://dclib.sourceforge.net/

html++ CGI Class Library
   Encapsulates HTML tags and features. Manages dynamic Web page generation, CGI and forms processing, cookies, http file uploads, and sessions.
   http://www.dcmicro.com/htmlpp/

macstl
   A Macintosh optimized C++ source library. It include std::valarray optimized for the Altivec execution engine; std::vector partially specialized on the Mach allocator, for OS-level copy-on-write; a convenient and efficient wrapper for Altivec data types
   http://www.pixelglow.com/macstl/

muParser - a fast math parser library
   An extensible cross platform library for parsing mathematical expressions.
   http://muparser.sourceforge.net/

s11n
   (short for "serialization") An STL-based C++ library for serializing PODs, STL containers and client-defined types.
   http://s11n.net

txObject ATK
   A collection of platform-independent C++ class libraries that provides a five-layer framework containing an Object Library, IO and Timers, Threads, Inter-Process Communication, and Distributed Object Communication.
   http://txobject.sourceforge.net/