nixCraft: Linux Tips, Hacks, Tutorials, And Ideas.
Martin Fowler: Martin Fowler is an author, speaker, and loud-mouth on the design of enterprise software, work for ThoughtWorks. This blog focus on skills and techniques that help you improve the profession of software development in your career.
Joel on Software: Joel Spolsky is CEO (and co-founder) of StackOverflow. The author of blog share about software development, management, business, and the Internet.
Coding Horror: The author of this blog is Jeff Atwood, co-founder of StackOverflow with Joel Spolsky. Blog share a lot of quality articles and discussion about Software development.
GeeksforGeeks: A Computer Science portal for geeks. It contains well written, well thought and well-explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.
DEV Community: Where programmers share ideas and help each other grow.