IIT lecture notes

http://www.nptel.iitm.ac.in/

Online C & C++ courses

http://www.macs.hw.ac.uk/~rjp/Coursewww/

Introduction to Programming Using Java

http://math.hws.edu/javanotes/

HTML Course

http://www.w3.org/

Theory of Computation

www.cs.bu.edu/~lnd/toc

Computer Organization / Architecture

http://williamstallings.com/COA5e.html

Online Training Courses for different programming languages

http://www.e-learningcenter.com/free.htm

Computer Science Video Lecture Courses

http://freescienceonline.blogspot.com/2006/06/free-computer-science-video-lecture_24.html

Object Oriented Programming

http://www.aonaware.com/OOP1.htm

Microcontrollers and Microprocessors

http://mic.unn.ac.uk/miclearning/modules/micros/ch1/micro01notes.html

Operating Systems

http://williamstallings.com/OS4e.html

.       http://en.wikipedia.org/wiki/Operating_system

Computer Books, Tutorials and Lecture Notes

http://freecomputerbooks.com

www.freetechbooks.com

Computer Science Library by Stanford University

http://cslibrary.stanford.edu/

Structure and Interpretation of Computer Programs.

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-001Spring-2005/CourseHome/index.htm

Video lectures for Computer Programs