Topic wise Reference Books/Material

1) Data Structures and Algorithms:
IITD video lectures on Data Structures And Algorithms
Algorithm Book by by S. Dasgupta, C.H. Papadimitriou, and U.V. Vazirani
Introduction to Algorithms by Cormen, Thomas H.
Data Structures And Program Design In C by Kruse Robert L., Robert Kruse, Cl Tondo
2) Database Management System
Lecture Slides of Database System Concepts by Silberschatz, Korth and Sudarshan
Lecture Slides of Database Management Systems by Raghu Ramakrishnan and Johannes Gehrke
Lecture Handouts from university of pittsburgh
3) Computer Networks
Lecture Notes from Prof. Dheeraj Sanghi, IIT Kanpur
Lecture Slides of Computer Networking: A Top Down Approach Featuring the Internet by Kurose and Ross
Lecture Notes by Prof. Ajit Pal, IIT Kharagpur
Web Resources on Computer Networks by Andrew S. Tanenbaum.
4) Operating Systems
Operating Systems Notes
Operating Systems Lessons from VirginiaTech Univ.
Operating System Notes from Kent Univ.
Video Lectures by Prof. John Kubiatowicz, Berkeley
Lecture Slides of Operating System Concepts, 7th Edition by Silberschatz, Galvin, Gagne
5) Compiler Design
Dragon Book Lecture Notes
Lecture Notes by Leonidas Fegaras
Lecture Notes from Kent University