ALL IMPORTANT LINKS

                                                       ALL IMPORTANT LINKS  

Algorithms

- Topcoder Algorithms Tutorial: http://www.topcoder.com/tc?d1=tutorials&d2=alg_index&module=Static
- GeeksForGeeks: http://www.geeksforgeeks.org/
- Leetcode: http://leetcode.com/

Web Dev

- Monstrous list of front-end development tutorials:https://github.com/dypsilon/frontend-dev-bookmarks
- Basic intro to some popular web technologies:http://www.w3schools.com/
- Good courses and sample projects in JS, Ruby and Python :http://www.learnstreet.com/

General

- Some fine tutorials on Python, C, Ruby, Regex, etc IFF you can follow* the exercises: http://learncodethehardway.org/
*solve everything instead of just glancing though all the code and text
- http://www.code.org/
- http://teamtreehouse.com/
- Listing of common topics under various CS subjects: https://learn-cs.pbworks.com/w/page/15774601/FrontPage#NETWORKING
- Beginner step towards Ruby- tryruby.org
- An expansive collection of tutorials and resources:http://www.dreamincode.net/

Competitive Programming(and Practice):
- Topcoder: http://www.topcoder.com/
- Codechef: http://www.codechef.com/
- Spoj: http://www.spoj.com/
- Codeforces: http://codeforces.com/
- HackerRank: https://www.hackerrank.com/categories/ai/introduction
- HackerEarth: http://www.hackerearth.com/
- UVa Online Judge: http://uva.onlinejudge.org/
- Quora Challenges: http://www.quora.com/challenges
- Facebook Challenges: https://facebook.interviewstreet.com/recruit/challenges
- CodingBat: http://codingbat.com/

Open Source:
- OpenHatch: http://openhatch.org/
- Freecode: http://freecode.com/
- Code52 : https://github.com/Code52
- SourceForge: http://sourceforge.net/
- Google code: https://code.google.com/
- TeachingOpenSource: http://teachingopensource.org/index.php/Main_Page

Video Lectures:
Huge list of video tutorial sites: http://www.quora.com/Coursera/What-are-some-websites-similar-to-Coursera
Another huge list with many common links:http://quoreddit.quora.com/The-Best-Online-Learning-Centers
Lynda.com : Lectures on a wide array of technologies, most of them non-boring.
Video lectures on almost everything: http://www.teachingtree.co/

Compilers:
- http://stackoverflow.com/questions/1669/learning-to-write-a-compiler
- http://programmers.stackexchange.com/questions/165543/how-to-write-a-very-basic-compiler

Personal Recomendations:
(Include any lectures/tutorials you have followed and found significantly more effective than the rest; include your name so those seeking clarifications can make directed queries)
- HTML5 and CSS: http://thenewboston.org/ [sananda jain]
- PHP & MySQL - Beginners PHP & MySQL from Wrox Publications [koustuv sinha]
- PHP and MySQL - Lynda.com tutorials: 1. PHP & MySQL Essentials, 2. PHP & MySQL Beyond the Basics. [adarsh yagnik]
- Tests : http://www.studytonight.com/ [hitesh kundlia]

Course Search Engine:
- www.class-central.com: Search for online courses over internet

Best Free Ebooks for any CS-IT course :
www.it-ebooks.info