Resource library

Matching resources

• Government or standards bodyToolFree

  ShakeAlert (opens in a new tab)

  USGS

  Earthquake early warning for the West Coast. It buys seconds, not minutes, which is enough to get under a table and nowhere near enough to leave a building.

• Government or standards bodyToolFree

  PVWatts solar calculator (opens in a new tab)

  NREL

  Estimate what a panel array will actually produce at your address and tilt. Run it before you buy, because the number is usually lower than the marketing figure by a wide margin.

• Established nonprofitToolFree

  Kiwix (opens in a new tab)

  Kiwix

  Reads offline copies of Wikipedia, Stack Exchange, medical references and more. The single highest-value piece of software in this whole library, and it runs on a phone.

• Practitioner or communityToolFree

  Organic Maps (opens in a new tab)

  Organic Maps

  Offline maps and turn-by-turn routing with no account and no tracking. Download your state before you need it, which is the whole point and the step everyone forgets.

• Practitioner or communityToolFree tier

  CalTopo (opens in a new tab)

  CalTopo

  Serious topographic mapping with printable outputs, slope shading and fire history layers. The free tier prints a good paper map, which is the version that works with a dead phone.

• Practitioner or communityToolFree

  Meshtastic (opens in a new tab)

  Meshtastic

  Open source LoRa mesh messaging on cheap hardware, no licence needed. Range claims vary wildly with terrain, so test yours before you plan around it.

• Practitioner or communityToolFree

  Winlink Global Radio Email (opens in a new tab)

  Winlink

  Email over radio when the internet is gone, used heavily in real disaster response. It requires a licence and some setup patience, and it is the closest thing to normal messaging without infrastructure.

• Practitioner or communityToolFree

  Battery University (opens in a new tab)

  Cadex Electronics

  Plain explanations of how lithium, lead acid and other chemistries age, charge and fail. Read the storage-state article before you put a battery bank away for a year.

• Practitioner or communityToolPaidOurs

  PrepperGPT (opens in a new tab)

  PrepperGPT

  An offline survival AI on a USB drive, with a local model and reference library that work with no network. One of our own projects, listed here because it belongs in this category, not because it is free.