Scratch 3 With OneGPIO Extensions

The online version is launchable here.

Quick Intallation Intructions:

For Arduino, Circuit Playground Express, ESP-8266, Robohat-MM1, and Raspberry Pi Pico boards, install the server firmware. See the Preparing Your Micro-Controller section of the User's Guide.
Launch the Scratch3 Editor using either the online or offline sites described in the Ready, Set, Go/Launch The Scratch3 Editor section of the User's Guide.
Select your extension and start coding!.

Read the Installation And Usage Guide.

Raspberry Pi Pico Blocks

Arduino Blocks

ESP-8266 Blocks

Raspberry Pi Blocks

Picoboard Blocks

RoboHAT MMI Blocks

SPECIAL NOTE FOR BUILDING

Make sure you are using:

npm 9.6.3

nodejs v19.9.0

yarn 1.22.19