• Programming in C in unix tutorial
• 
  

• GNU Compiler Collection includes the most commonly used C compiler.
• The GNU C Library Reference Manual.
• The ANSI definition of C programming language.
• Programming in C:  A Tutorial, Brian Kernighan
• Notes on Programming in C, Rob Pike.
C FAQs, Steve Summit Pike.

• An introduction to Socket Programming.
• Beej's Guide to Network Programming.

• Computer Books online
  
• A pool of tutorials
  
• http://www.tcfb.com/freetechbooks/bookphyton.html
  
• http://www.futuredesigners.com/
  
• http://www.intelinfo.com/free_computer_books.html
  
• http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/
  
• http://ebookdirectory.com/search/Computer_L2K_Internet/
• Berkeley DB
• Documentation at Sleepy Cat Software : Makers of Berkeley DB
  
• Download here
• Using Libraries in Linux/Unix
• Building And Using Static And Shared "C" Libraries
• xcdroast
• X-CD-Roast Manual
• nuplot
• Introduction to gnuplot
• StyleSheet
• http://www.trans4mind.com/personal_development/StyleSheets/CreatingStyleSheetFiles.htm
• HTML
• Good HTML tutorial
• CGI
• CGI made really easy [Short tutorial] 
• http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/CGI%20Manual%20of%20Style%20Online,%20by%20Robert%20McDaniel/
• Shell Programming
• http://steve-parker.org/sh/sh.shtml
• Latex
• Mathematical Symbols for Latex
  
• Graphics and Colour with Latex
  
• TeX Frequently Asked Questions
• Matlab
• http://www.mathworks.com/access/helpdesk/help/techdoc/ref/plot.shtml
• Mathematica
• Global optimization 4.2
  
• mathematica tutorial
• CVS
• http://developer.apple.com/internet/macosx/cvsoverview.html
  
• Concurrent Versions System : Ben Fennema
• Crontab
• CRONTAB tutorial
• VIM editor
• At Linux Howto
  
• At frymaster.dyndns.org  
  

Here are some links to papers/articles which I believe most people related to computers will enjoy reading. Go ahead!

• Reflections on Trusting Trust, Ken Thompson
• Go To Statement Considered Harmful, Edsger W. Dijkstra
• Why Pascal is Not My Favorite Programming Language, Brian W. Kernighan
• The Ten Commandments for C Programmers, Henry Spencer
• On the Criteria To Be Used in Decomposing Systems into Modules, D.L. Parnas
• Program Development by Stepwise Refinement, Niklaus Wirth
• Machine of the Year, 1982, Times Magazine: The Computer Moves In
• The Computer for the 21st Century , Mark Weiser
• How (and How Not) to Write a Good Systems Paper, Roy Levin and David D. Redell
• Hints for Computer System Design, Butler W. Lampson
• Linux Anecdotes, Lars Wirzenius
• The Hello World Page
• ACM Turing Award Lectures

News

• Telugu online news papers
  
• Ennadu
• Vaartha
• Andhrabhoomi
• Technical online news
  
• CNEWS
• English news
• Google news