Squawk! is a small utility originally created to generate valid transponder codes for flight simulation flights that aren't ATC-controlled.
Additionally it includes a top of descent calculator and it can pull METAR/TAF information from the real world (your simulator's weather may differ).
To build Squawk!, after cloning the repository to a local folder, set up a virtual environment in that folder:
python -m venv .
After activating the environment, install the dependencies from PIP:
pip install -r requirements.txt
Then, build Squawk! by running:
pyinstaller --clean --noconfirm squawk.spec
There will be an executable file created in the dist folder.