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 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.
Cprogramming.com - Source Code
A collection of source code including graphics,game,and sound source.
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.
Mukil's C Programs
Contains implementation of data structures such as stacks, queues, linked lists and other C programs with sources.
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.