Some useful material and links for C 

My notes

Strings and using them: Strings.c
Enum, typedef and structures: C-Notes.doc

• [Open source and Free] 
• GNU compiler collection available at http://gcc.gnu.org/
  
• Bloodshed Dev-C++ is a full-featured Integrated Development Environment (IDE) for the C/C++ programming language. It uses Mingw port of GCC (GNU Compiler Collection) as it's compiler. Dev-C++ can also be used in combination with Cygwin or any other GCC based compiler.
  http://www.bloodshed.net/devcpp.html
• [Free] 
• The lcc-win32 system is a full featured C Development Environment for  Microsoft Operating Systems written by Jacob Navia. Its free for non-commercial development. Follow the download link at the bottom of the page, you are simply asked for your name and email. 
  http://www.q-software-solutions.de/products/lcc-win32/index.shtml

• Exhaustive list of compilers at  http://www.bloodshed.net/compilers/index.html

• http://www.tenouk.com/clabworksheet/clabworksheet.html

• http://publications.gbdirect.co.uk/c_book/

University of Leicester Online Web based C-Course

• http://www.le.ac.uk/cc/tutorials/c/index.html

Dave Marshall Online C-Course

• http://www.cs.cf.ac.uk/Dave/C/CE.html

Steve Summit

• C FAQ http://www.eskimo.com/~scs/C-faq/top.html
• Introductory C programming class notes http://www.eskimo.com/~scs/cclass/notes/top.html
• Intermediate C programming class notes http://www.eskimo.com/~scs/cclass/int/top.html

Peter Burden C Progamming Notes

• http://www.scit.wlv.ac.uk/~jphb/cbook/html/

Stanford University's short concise Essential C notes

• http://cslibrary.stanford.edu/101/

Ted Jensen's Pointer Tutorial

• http://pweb.netcom.com/~tjensen/ptr/pointers.htm

C Programmers Reference

• http://cermics.enpc.fr/~ts/C/cref.html

• http://refcards.com/refcards/c/c-refcard-letter.pdf

• http://www.acm.uiuc.edu/webmonkeys/book/c_guide/index.html

C library Useful On line reference

• Eric Huss C Library Reference Guide http://cs.senecac.on.ca/~dabesdri/ref/index.html
• http://www.infosys.utas.edu.au/info/documentation/C/CStdLib.html#stdlib.h

• A Tutorial on Make here http://www.eng.hawaii.edu/Tutor/Make/

GCC

• Introduction to GCC
  www.network-theory.co.uk/docs/gccintro
• Using the gcc/g++ compiler
  http://users.actcom.co.il/~choo/lupg/tutorials/c-on-unix/c-on-unix.html
• Debugging with gdb
  http://users.actcom.co.il/~choo/lupg/tutorials/debugging/debugging-with-gdb.html