/usr/share/doc/sreeglug

OpenCode — open-source AI coding agent

The open-source AI coding agent for the terminal (also a desktop app and IDE extension). One docs hub covers everything: getting started (/init, Plan vs Build mode, @-file mentions, /undo), agents & rules, Agent Skills (SKILL.md), plugins, custom tools, MCP servers, themes and keybinds — opencode.ai/docs.

The Missing Semester of Your CS Education (MIT)

Shell, editors, git, debugging, data wrangling — everything a CS degree skips. Essential.

opensource-tools — curated tools for students

The GLUG's curated collection of free and open-source tools for students — editors, utilities and everyday software that respects your freedom.

RFC Editor — the internet's open standards

Every internet protocol — TCP, HTTP, DNS, SMTP — is specified in freely readable RFCs.

W3C Standards

The open standards the web is built on — HTML, CSS, accessibility.

RISC-V ISA specifications

Read the open instruction-set architecture everyone in open hardware is excited about.

KiCad documentation

Free, open EDA suite for designing PCBs — schematics to layout.

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

GNU Philosophy — free software is a matter of liberty

The essays behind the movement: the four freedoms, licensing and why 'open source' isn't the same thing.

Overleaf Learn (LaTeX)

Free 30-minute LaTeX tutorials — write your lab reports and theses properly.

OpenStax textbooks

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

Khan Academy

Math from arithmetic to linear algebra — the foundation every branch stands on.

SWAYAM

India's national MOOC platform — free courses with optional certification, all branches.

MIT OpenCourseWare

Thousands of MIT courses — lecture notes, assignments, exams — free for everyone.

NPTEL

Free video courses from India's IITs and IISc across every engineering discipline.

Hugging Face course

Learn to use and fine-tune open transformers — free and hands-on.

Google Machine Learning Crash Course

A free, fast, practical introduction to machine learning with TensorFlow.

Dive into Deep Learning (D2L)

An interactive open book — every concept has runnable code.

Practical Deep Learning for Coders (fast.ai)

Top-down deep learning: train real models from lesson one.

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.

OWASP Cheat Sheet Series

Concise, practical guidance on auth, sessions, XSS, SQLi and more.

OWASP Top 10

The ten most critical web application security risks — read before you deploy anything.

picoCTF

A free, year-round capture-the-flag built for students — start here for cybersecurity practice.

OverTheWire Wargames

SSH-based security games — Bandit teaches the command line while teaching you to break things.

Kubernetes documentation

Where every cluster journey begins (and, occasionally, ends).

The Twelve-Factor App

The methodology behind well-behaved, deployable services — short and formative.

Docker documentation

Containers, images and compose — the docs are genuinely good.

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.

CMU 15-445: Database Systems (lectures, free)

Andy Pavlo's legendary database internals course — videos and notes free online.

Use The Index, Luke

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

SQLBolt

Learn SQL with short interactive lessons in the browser.

PostgreSQL interactive tutorial

The official tutorial for the database this very website runs on.

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.

Exercism

Free practice exercises in 60+ languages with human mentor feedback.

Teach Yourself Computer Science

A curated roadmap: which 9 subjects to self-study and exactly which books/lectures to use.

The Odin Project

A free, open-source full curriculum for web development that makes you build real projects.

freeCodeCamp

Thousands of hands-on exercises and full certifications — web, data, Python and more.

CS50: Introduction to Computer Science (Harvard, free)

The famous first CS course — C, Python, SQL and web, with great problem sets. Free to audit.

MDN Web Docs

The reference for HTML, CSS, JavaScript and web standards.

The official Python tutorial

Reads like a book, ships with the language — start here for Python.

Oh Shit, Git!?

Plain-language recipes for every 'I messed up my repo' moment.

Learn Git Branching

Interactive visual playground — the fastest way to finally understand branches, rebases and resets.

Pro Git (book)

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

The Art of Command Line

A community-maintained goldmine of practical one-liners and workflow tips.

ShellCheck

Static analysis for shell scripts — it will find the bug before your script does.

ExplainShell

Paste any shell command and see exactly what each flag does. Magic for reading unfamiliar one-liners.

Bash Reference Manual (GNU)

The official bash manual — boring, complete and always right.

Debian documentation

The universal OS's manuals — installation, administration and packaging, all free.

Linux kernel documentation

Straight from kernel.org — how the kernel is built, configured and developed.

Linux Upskill Challenge

A free 21-day self-paced challenge to get comfortable administering a real Linux server.

Arch Wiki

Distro-agnostic, brutally thorough Linux documentation. When something breaks, this is where the answer usually lives.

The Linux Command Line (book)

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

by William Shotts

Linux Journey

Short, friendly lessons that take you from 'what is an OS' to networking, processes and packages — the classic first stop.