MITMf

MITMf is the man in the middle framework.

This is a really nice tool written in Python, and capable of carrying out man in the middle attacks using multiple methods (think Bettercap but implemented in Python instead of Ruby, yay!).

The best part of MITMf is that you can process packets using Scapy - so you can capitalize on all that knowledge you already have of that library.