Mousenger is an open-source chat program written in Python with separated server and client-sided programs.
Mousenger client program relies on PyQt6 for GUI. The server program relies on mysql-connector-python for database management. Both sides also include some packages in the Python standard library, which don't need extra effort to install before the use of Mousenger.
Enjoy!
PS: The reason that this program is named so, is because I like mouse, and it sometimes resembles my own lifestyle quite well.