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Free C/C++ Libraries, Source Code and Frameworks(thefreecountry.com): "Free C / C++ Libraries, Source Code and Frameworks
Here are some C and C++ libraries, DLLs, VCLs, source code, components, modules, application frameworks, class libraries, source code snippets, and the like, that you can use with your programs without payment of fees and royalties. Note that some libraries (etc) listed here may have certain restrictions about its use and/or distribution. Be sure you read the licence conditions in each package before using them.
A few types of libraries have been moved to their own pages, due to the large number of items in those categories. Here are some of the other pages containing free libraries on this site:
Free Compression and Archiving Libraries
Free Database Libraries, SQL Servers, ODBC Drivers, and Tools
Free Debugging Libraries, Memory Leak and Resource Leak Detection, Unit Testing
Free Encryption Libraries
Free C/C++ Font Libraries
Free Games Programming Libraries and Source Code
Free Graphics, Image Drawing Libraries, 3D Engines, 2D Engines
Free GUI Libraries
Free Numerical, Graphs, Statistics and Mathematical Libraries
Free Sockets, Winsock, TCP/IP, Internet Libraries
Free Standard Template Libraries (C++ STL Libraries)
Free Thread Libraries
Free Audio, Sound, Music, Digitized Voice Libraries
All Other Free C/C++ Libraries and Source Code
Master Index of Free Programming Libraries and Source Code "