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STL Error Decryptor for Visual C++
A set of tools to shorten the length of VC++ 6/7 STL-related error messages, allowing essential information to fit in status bar at the bottom of the Visual Studio IDE. [Freeware]
www.bdsoft.com/

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.
www.sophists.com/

Levenberg-Marquardt non-linear least squares algorithms in C/C++
Package containing double and single precision flavors of the Levenberg-Marquardt algorithm. Included are versions with analytic and finite difference approximated jacobians. [Open source, GPL]
www.ics.forth.gr/

Class, Max and the Class Act
Profile and links.
www.delafont.com/

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 source and commercial alike. [Open Source]
incubator.apache.org/

ORBit-C++
C++ bindings that provide a CORBA specification-compliant C++ mapping for ORBit. [Open Source, GPL/LGPL]
orbitcpp.sourceforge.net/

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

Linux Tutorial: - C++ String Class Tutorial
String class C++ examples.
www.yolinux.com/

C++ Matrix Template Class Library
Supports arithmetic operations, sub-matrix operations, inversion, various matrix decompositions, solution of simultaneous linear equations, and eigen value and eigen vector problem. (by Techsoft)
www.techsoftpl.com/

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]
www.elcel.com/