Primers
Interactive apps for learning a subject from scratch, by doing it: wire the circuit, send the packet, light the fire, and watch what happens. Free, and they run right in the browser.
Protocol Explorer
Watch the internet work, packet by packet. Lessons on HTTP, DNS, TCP, TLS, Wi-Fi, SSH, VPNs and more play out on a network diagram, and every packet opens up so you can read it byte by byte.
Electronics 101
Electronics from scratch on a 3D workbench: batteries, resistors, LEDs, capacitors, switches, transistors and sensors. Switch each circuit on, swap its parts and watch the current flow.
Backcountry 101
Survival skills, step by step, in 3D. Light a campfire, make a bow drill, filter water, build a lean-to, signal for rescue, tell edible plants from poisonous ones and pack a survival kit.
Learn ESP32
Wire LEDs, sensors, motors and servos to a 3D ESP32, connect it over Wi-Fi and Bluetooth, then run the code and watch it work, from flashing two LEDs to a sun-tracking solar panel.
Learn Arduino
Learn Arduino on a 3D Uno: wire up LEDs, buttons, sensors, motors and servos, then run real sketches and watch the board respond, from blinking an LED to a smart plant.