Free C/C++ Source Code
Bob Stout's SNIPPETS
General-purpose header files, miscellaneous C-callable functions, portable file operations, assorted math functions - I'd need three pages just to describe all the free source code and you can view it or download it as a ZIP or TAR file.
Mozilla Source Code
The complete C/C++ source code for the Mozilla open source web browser. You can browse the up-to-the-minute latest version of the source code online and find instructions on building the latest version.
C++ Nugget Mine
A collection of succinct C++ code examples.
BBDSoft
Several C++ class libraries libraries developed by BBDSoft are available for download. Complete source code included.
Socket Programming in C, Simple Examples
Socket Programming in C with examples of UDP, TCP and IP multicast client and servers.
Code Beach
Free and Open Source Code and Tutorials
AcmeSofties
This site contains C C++ programs provided with source codes for constructive work by programming enthusiasts.
Cobol Compiler Source Code
The C source code for a cobol compiler that is no longer under development.