Circuito.io - Instant code and wiring for your project
Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
InstaPart - Build circuit boards faster with parts delivered in <24 hrs
Raspberry Pi - The Raspberry Pi is a tiny and affordable computer that you can use to learn programming through fun, practical projects. Join the global Raspberry Pi community.
library.io - Learn electronics and easily create circuit boards online
PlatformIO - Next-generation IDE for IoT