Scratch also has a plugins for BBC Micro:bit and Lego Boost. They work well although the old Boost hardware is lacking storage so only works in Bluetooth tethered mode. The solutions have two parts: 1. a side application to facilitate the Bluetooth connection from the web browser to the device; 2. additional block types to control the servos etc.

https://scratch.mit.edu/microbit

https://scratch.mit.edu/boost https://scratch.mit.edu/boost