Serial Terminal
A nice-looking serial terminal on the web. Open-Source, free, and easy to use. Perfect for quickly communicating with your Arduino projects.
Duckify
Duckify is a free and open-source converter for turning BadUSB scripts into Arduino sketches that can run on development boards like the Digispark.
ESP Web Tool
Flash your ESP32 or ESP8266 through your browser. Open-Source, free, and easy to use.