The best websites a programmer must visit?

Quora

Programming Practice and Contest

• http://www.codechef.com/
• Sphere Online Judge (SPOJ)
• Programming Praxis
• Project Euler
• TopCoder, Inc. | Home of the world's largest development communityTopCoder, Inc. | Home of the world's largest development community
• Codeforces
• Programming Contests - Codesprints - Interviewstreet
• HackerEarth Beta
• The Python Challenge
• HackerRank

Tutorials

• LearnStreet
• GeeksforGeeks
• Code School
• Bit Twiddling Hacks
• CS 97SI: Introduction to Competitive Programming Contests
• CSE Blog - quant, math, cse puzzles: EasyPuzzles
• Me, Myself and Mathematics

Social Interaction

• Home - Quora
• Stack Overflow
• Interview Questions | CareerCup
• GitHub · Build software better, together.

Must Read

• Teach Yourself Programming in Ten Years
• 10 Puzzle Websites to Sharpen Your Programming Skills

Taken from Quora