BlueParrots
   C,C++ source code examples for games,graphics and sound.
   http://www.blueparrots.com/

C C++ Users Journal
   Source code of basic and advance C language.Good for not only new users but also technical users see it and use it.
   http://www.ddj.com/dept/cpp/cuj.jhtml

C Code Fragments and Snippets
   A small online repository containing; c code fragments, snippets and examples, some basic programs and general documentation all regarding GNU/Linux system administration and C programming.
   http://www.rdrs.net/

C Programming for Engineering Applications
   Free C source code and tutorials for engineering applications. Includes graphics, both polar and quadratic, dealing with files, integration, quality control and inspection.
   http://www.bigprof.com/c4engineering/

C Source Codes @ VyomWorld.com
   Contains categorized source codes in C, including interaction with Hardware.
   http://www.vyomworld.com/source/LanguageHome.asp?LangId=1

CRBond
   Source codes of scientific applications, graphic applications and math applications.
   http://www.crbond.com/

Christensen Tools Page
   Contains software tools (C sources) related to performance evaluation and TCP/IP sockets programming.
   http://www.csee.usf.edu/~christen/tools/toolpage.html

Cnippets
   Melange of drop-in C code including a fixed-size memory pool and a generic, user-definable hash implementation.
   http://www.25thandclement.com/~william/projects/cnippets.html

Cprogramming.com - Source Code
   A collection of source code including graphics,game,and sound source.
   http://www.cprogramming.com/cgi-bin/source/source.cgi

Exceptions in plain C
   Hack which enables throwing and catching exception structures (which can be of anything) through non-local jumps.
   http://adomas.org/excc/

Hello, World program
   Your first C program.
   http://www2.latech.edu/~acm/helloworld/c.html

Memory Structures Library (MemSL)
   Data structures, collections, algorithms with source code for C and C++.
   http://www.softwaresensation.com/mainView.jwa?c=memSLIntro

Mozilla
   An open-source web browser, designed for standards compliance, performance and portability.
   http://www.mozilla.org/

ProgrammersHelp
   Categorised C source code.
   http://www.programmershelp.co.uk/ccatcode.php

Publib
   Attempt at creating a library of reusable C functions.
   ftp://ftp.funet.fi/pub/languages/C/Publib/

Ramakrishan Venkitaraman's Home Page
   Contains source code for networking and distributed system projects. Also contains the source code for the Garbage Collector for the C programming language.
   http://www.utdallas.edu/~ramakrishnan/

VyomWorld.com - C Projects Page
   Contains C/C++ Projects with source code.
   http://www.vyomworld.com/source/c_projects.asp