Integrated C++ Foundation Libraries, including Inti::GTK, a C++ GTK+ binding (No longer an active project).

An implementation of the C++ Standard Library. [Open Source]

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]

Provides freely available STL-like extensions, including STL-style wrappers for common operating system and framework APIs (such as Windows, Unix, COM, MFC, ATL).

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 Solu...

Provides a repository for free peer-reviewed portable C++ source libraries. The emphasis is on libraries which work well with the C++ standard library.

Platform independent C/C++ library for date and time calendric calculations. (by Hofmann Software Engineering International)

A C++ toolkit which enables developers to created distributed peer to peer solutions using agent engineering.

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 typ...

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]