A cross-platform C++ library providing high-performance and portable classes for multi-threading, I/O, networking, Unicode and XML parsing. [Commercial]

A set of C++ libraries to speed development and extend application capability. [Open source, GPL]

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)]

Includes base class components, collections, I/O classes, network and Internet classes, object database support, and thread library.

A C++ class library to support integration and migration of Fortran to C++. ObjexxFCL includes Fortran-compatible array, string, and intrinsic function support.

A C++ library which provides object oriented alternatives to C++ primitives and the STL collections. [Open source, Boost license]

An extensible cross platform library for parsing mathematical expressions.

Implements a full callback system for use in widget libraries, abstract interfaces, and general programming. [LGPL]

Provides an easy way to generate Excel Spreadsheets (xls-files) in custom applications without Microsoft Excel. Supports writing text, numbers, formulas, hyperlinks and images to cells with various formatting options. Available as a static library for...

A portable, cross-platform C++ library designed to add various kinds of word processing (rich text) or text editing capabilities to your application.