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The Cathedral and the Bazaar (essays)

Eric Raymond's essays on how open development works — part of the movement's history.

by Eric S. Raymond

Producing Open Source Software (book)

How successful free software communities actually run — invaluable if you want to run or contribute to one.

by Karl Fogel

OpenStax textbooks

Peer-reviewed, openly licensed textbooks — physics, chemistry, maths, economics and more.

Dive into Deep Learning (D2L)

An interactive open book — every concept has runnable code.

Neural Networks and Deep Learning (book)

Michael Nielsen's free book — build neural networks from first principles.

by Michael Nielsen

Crypto 101 (book)

An introductory crypto book, free for everyone — from XOR to TLS.

Computer Networking: Principles, Protocols and Practice

An open networking textbook used in universities worldwide.

Beej's Guide to Network Programming

Sockets explained with humour and precision — the classic intro to network programming in C.

Use The Index, Luke

A free book on SQL indexing and performance — the thing every developer wishes they had read earlier.

Structure and Interpretation of Computer Programs (SICP)

The classic MIT text on programming fundamentals, free HTML edition.

Crafting Interpreters (book)

Build two complete interpreters from scratch, free to read online — the friendliest way to meet compilers.

Pro Git (book)

The canonical Git book, free to read in full — from basics to internals.

The Linux Command Line (book)

William Shotts' complete, free book on the shell — the single best introduction to the command line.

by William Shotts