This repository contains the source code of the Arduino IDE 2.x. If you're looking for the old IDE, go to the repository of the 1.x version. The Arduino IDE 2.x is a major rewrite, sharing no code ...

Arduino Board Package to Debug Uno/ATmega328P with CH552 debugger in Arduino IDE 2.0.0 - DeqingSun/unoDebugTestPackage ...

Those tools are built into his AVRPascal code editor to create a Pascal-based alternative to the Arduino IDE for programming AVR-based microcontrollers.