Ashok's C programs: Implementation of data structures.
BlueParrots: C,C++ source code examples for games,graphics and sound.
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.
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.
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.
C Source Codes @ VyomWorld.com: Contains categorized source codes in C, including interaction with Hardware.
Christensen Tools Page: Contains software tools (C sources) related to performance evaluation and TCP/IP sockets programming.
Cnippets: Melange of drop-in C code including a fixed-size memory pool and a generic, user-definable hash implementation.
Cprogramming.com - Source Code: A collection of source code including graphics,game,and sound source.
CRBond: Source codes of scientific applications, graphic applications and math applications.
DevLibrary: Source code, tutorials, files, forums, and other development tools.
Exceptions in plain C: Hack which enables throwing and catching exception structures (which can be of anything) through non-local jumps.
Hello, World program: Your first C program.
Mat Fisher's Homepage: C programs written for projects at university. Lots of comments included in the code. Also contains pictures of nights out at Surrey university.
Memory Structures Library (MemSL): Data structures, collections, algorithms with source code for C and C++.
MetalShell - Source Code Examples: Several different programming examples including linked lists, database interfacing, file I/O, encryption, sockets.
Mozilla: An open-source web browser, designed for standards compliance, performance and portability.
Mukil's C Programs: Contains implementation of data structures such as stacks, queues, linked lists and other C programs with sources.
ProgrammersHelp: Categorised C source code.
Publib: Attempt at creating a library of reusable C functions.
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.
Sample C Source Code: Source code for sample C programs. Beginner examples as well as graphics library benchmark examples.
VyomWorld.com - C Projects Page: Contains C/C++ Projects with source code.