Niranjan Singh's coding blog

There was thread on Stackoverflow which contribute the list of free programming books. The Original Source for these free books as below:
 List of freely available programming books
Further I found a nice maintained list on GitHub – Free programming books and subset of the list is here:

Parallel Programming

• High Performance Computing (PDF, ePUB) - Charles Severance & Kevin Dowd
• High Performance Computing Training (LLNL materials)
• High-Performance Scientific Computing (class lectures and slides)
• How to Write Parallel Programs
• Introduction to High-Performance Scientific Computing - Victor Eijkhout
• Introduction to Parallel Computing - Blaise Barney
• Is Parallel Programming Hard, And, If So, What Can You Do About It? - Paul E. McKenney
• Programming on Parallel Machines; GPU, Multicore, Clusters and More - Norm Matloff
• The OpenCL Programming Book

Partial Evaluation

• Partial Evaluation and Automatic Program Generation - (PDF) Jones, Gomard and Sestoft

Professional Development

• Apprenticeship Patterns: Guidance for the Aspiring Software Craftsman - David H. Hoover and Adewale Oshineye
• Confessions of an IT Manager (RedGate, By Phil Factor)
• Don't Just Roll the Dice (PDF) (RedGate, By Neil Davidson)
• How to Do What You Love & Earn What You’re Worth as a Programmer (Leanpub, By Reginald Braithwaite)
• What I've Learned From Failure (Leanpub, By Reginald Braithwaite)
• Why programmers work at night (Leanpub, By Swizec Teller)

Programming Paradigms

• Introduction to Functional Programming (class lectures and slides)
• Type Theory and Functional Programming

Regular Expressions

• Learn Regex The Hard Way - Zed. A. Shaw
• The Bastards Book of Regular Expressions: Finding Patterns in Everyday Text - Dan Nguyen
• The 30 Minute Regex Tutorial - Jim Hollenhorst
• RexEgg

Reverse Engineering

• Hacking the Xbox: An Introduction to Reverse Engineering - Andrew "bunnie" Huang
• Reverse Engineering for Beginners (PDF) - Dennis Yurichev
• BIOS Disassembly Ninjutsu Uncovered 1st Edition (PDF) - Darmawan Salihun

Security

• Crypto 101 - Crypto for everyone
• Handbook of Applied Cryptography
• How to deal with Passwords
• Intrusion Detection Systems with Snort
• OpenSSL Cookbook
• OWASP Top 10 for .NET Developers
• Security Engineering
• CryptoParty Handbook

Software Architecture

• Architectural Styles and the Design of Network-based Software Architectures - Roy Thomas Fielding
• Best Kept Secrets of Peer Code Review
• Data-Oriented Design
• Domain Driven Design Quickly
• DSL Engineering: Designing, Implementing and Using Domain-Specific Languages - Markus Voelter
• Essential Skills for Agile Development
• Guide to the Software Engineering Body of Knowledge
• How to Design Programs
• How to Write Unmaintainable Code
• Kanban and Scrum - making the most of both
• Kanban for skeptics (Leanpub, by Nick Oostvogels)
• Methods and Techniques for the Design and Implementation of Domain-Specific Languages - Zef Hemel
• Naked objects - Richard Pawson
• NASA Manager Handbook for Software Development (PDF)
• NASA Software Measurement Handbook
• OAuth - The Big Picture
• Object-Oriented Reengineering Patterns
• Patterns and Practices: Application Architecture Guide 2.0
• Patterns of Software: Tales from the Software Community (PDF)
• Practicing Domain-Driven Design - Scott Millett
• Programming Reliable Systems (Joe Armstrong's PhD thesis) (PDF)
• Scrum and XP from the Trenches
• Seamless Object-Oriented Software Architecture (PDF)
• Software Architecture (PDF)
• Software Engineering for Internet Applications
• Web API Design
• Your API Is Bad (Leanpub, by Paddy Foran)

Standards

• UNIX - The POSIX Standard - IEEE Std 1003.1
• Linux Standard Base

Theoretical Computer Science

• An Introduction to the Theory of Computation
• Building Blocks for Theoretical Computer Science - Margaret M. Fleck
• Category Theory for Computing Science (PDF)
• Homotopy Type Theory: Univalent Foundations of Mathematics (PDF)
• Introduction to Computer Science - Prof. Subhashis Banerjee, IIT Delhi
• Introduction to Computing
• Introduction to Theory of Computation (PDF) - Anil Maheshwari and Michiel Smid
• Models of Computation - John E. Savage
• Network Science
• Practical Foundations for Programming Languages, Preview - Robert Harper
• Principles of Programming Languages - Scott F. Smith
• Programming and Programming Languages - Shriram Krishnamurthi
• Programming in Martin-Löf's Type Theory - Bengt Nordstroem
• Programming Languages: Application and Interpretation (2nd Edition)
• Semantics with Applications: A Formal Introduction - Hanne Riis Nielson, Flemming Nielson
• Structure and Interpretation of Computer Programs
• Structure and Interpretation of Computer Programs
• Theory of Computation - Sandeep Sen, IIT Delhi
• Think Complexity - Allen B. Downey

Web Performance

• Book of Speed by Stoyan Stefanov
• High Performance Browser Networking by Ilya Grigorik
• Mature Optimization by Carlos Bueno