🪖 Field & Technical Manuals
Thousands of real, comprehensive manuals — written to be followed in the field.
Army Publishing Directorate Core
The complete US Army library of field & technical manuals — signal & comms, combat medicine, engineering, survival, demolitions, vehicle maintenance. Thousands of authoritative documents.
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Military Medicine
Field surgical and combat-casualty instructional manuals.
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Ready.gov
Official US emergency-preparedness documents for every hazard.
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⚕️ Medicine & First Aid
Field medicine written for where there is no hospital.
Medical Encyclopedia
MDWiki — the full medical reference, curated by WikiProjectMed.
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Emergency Medicine
WikEM — the emergency-medicine field reference.
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Medical Library
Curated practical medicine for austere conditions.
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Medicine Textbooks
LibreTexts — open anatomy, physiology & clinical textbooks.
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Hesperian Health Guides
Where There Is No Doctor & the full Hesperian shelf — illustrated village healthcare, written for no-hospital conditions.
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🪓 Survival & Prepping
Water, food, shelter — getting through and rebuilding.
Survivor Library Core
How to rebuild technology from raw materials — thousands of scanned historical books: radio, electronics, machining, chemistry, steam power, agriculture, printing. The deep archive.
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Post-Disaster Library
The core resource library for after things break.
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Water Treatment
Finding, filtering and making water safe to drink.
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Food for Preppers
Storage, preservation and preparation.
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Library of Knots
The knots that actually matter, illustrated.
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True Prepper
Practical, no-nonsense preparedness guides.
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Appropedia
Appropriate tech — solar, biogas, sanitation, low-tech.
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Practical Action
Illustrated field documents — agriculture, water, energy and small-scale technology.
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🗺️ Maps & Navigation
The whole planet, street-level, rendered locally — no internet required.
📖 Textbooks & Science
Full open textbooks, cover to cover — real teaching material, not forum threads.
Khan Academy Core
The complete English course library — math, science, engineering and more, with every video lesson. A full school, offline.
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PhET Simulations
Interactive physics, chemistry & math lab simulations.
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CK-12 Textbooks
Full K-12 STEM textbooks — science, technology, engineering, math.
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Chemistry
LibreTexts — general, organic & analytical chemistry textbooks.
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Physics
LibreTexts — mechanics through modern physics.
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Biology
LibreTexts — open life-science textbooks.
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Engineering
LibreTexts — civil, mechanical & electrical engineering.
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Mathematics
LibreTexts — algebra through calculus and beyond.
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Geosciences
LibreTexts — geology, weather and earth science.
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🔧 Skills, Repair & Trades
Fix it, build it, learn a trade.
📚 Reference & Library
The whole of recorded human knowledge, offline.
Wikipedia
All 7M+ articles, with images. The everything-layer.
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Project Gutenberg
70,000+ public-domain books — the world's library.
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Wikibooks
Open textbooks — chemistry, electronics, trades.
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Wikiversity
Free courses and learning materials.
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Wiktionary
The largest dictionary on the web.
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Wikivoyage
The collaborative world travel guide.
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Energypedia
Renewable energy and energy-access knowledge.
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ArchWiki
The deepest Linux system-administration reference in existence.
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Internet RFCs
The complete RFC archive — the authoritative specs the internet itself runs on. Rebuild networking from the source documents.
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