Here's a list of everything imported - excluding stuff that's imported from within NanoVNA-Saver
It looks like numpy, scipy, serial and PyQT5.
Source File Import statement
Hardware/NanoVNA_V2.py import tty
Hardware/Hardware.py from collections import namedtuple
Hardware/VNA.py from collections import OrderedDict
NanoVNASaver.py from collections import OrderedDict
Windows/CalibrationSettings.py from functools import partial
Formatting.py from numbers import Number
SITools.py from numbers import Number, Real
Touchstone.py from operator import attrgetter
Settings.py from PyQt5 import QtCore, QtGui
SweepWorker.py from PyQt5 import QtCore, QtWidgets
Hardware/VNA.py from PyQt5 import QtGui
Hardware/NanoVNA.py from PyQt5 import QtGui
Hardware/NanoVNA_F.py from PyQt5 import QtGui
Charts/Polar.py from PyQt5 import QtGui, QtCore
Charts/Smith.py from PyQt5 import QtGui, QtCore
Inputs.py from PyQt5 import QtGui, QtWidgets, QtCore
Marker/Widget.py from PyQt5 import QtGui, QtWidgets, QtCore
Analysis/Analysis.py from PyQt5 import QtWidgets
Analysis/LowPassAnalysis.py from PyQt5 import QtWidgets
Analysis/VSWRAnalysis.py from PyQt5 import QtWidgets
Analysis/AntennaAnalysis.py from PyQt5 import QtWidgets
Analysis/BandStopAnalysis.py from PyQt5 import QtWidgets
Analysis/SimplePeakSearchAnalysis.py from PyQt5 import QtWidgets
Analysis/BandPassAnalysis.py from PyQt5 import QtWidgets
Analysis/PeakSearchAnalysis.py from PyQt5 import QtWidgets
Analysis/HighPassAnalysis.py from PyQt5 import QtWidgets
Widgets/SweepControl.py from PyQt5 import QtWidgets, QtCore
Windows/AnalysisWindow.py from PyQt5 import QtWidgets, QtCore
Windows/CalibrationSettings.py from PyQt5 import QtWidgets, QtCore
Windows/About.py from PyQt5 import QtWidgets, QtCore
Windows/TDR.py from PyQt5 import QtWidgets, QtCore
Windows/Bands.py from PyQt5 import QtWidgets, QtCore
Windows/SweepSettings.py from PyQt5 import QtWidgets, QtCore
Windows/DeviceSettings.py from PyQt5 import QtWidgets, QtCore
__main__.py from PyQt5 import QtWidgets, QtCore
NanoVNASaver.py from PyQt5 import QtWidgets, QtCore, QtGui
Windows/Screenshot.py from PyQt5 import QtWidgets, QtCore, QtGui
Windows/DisplaySettings.py from PyQt5 import QtWidgets, QtCore, QtGui
Windows/MarkerSettings.py from PyQt5 import QtWidgets, QtCore, QtGui
Charts/Phase.py from PyQt5 import QtWidgets, QtGui
Charts/SParam.py from PyQt5 import QtWidgets, QtGui
Charts/Magnitude.py from PyQt5 import QtWidgets, QtGui
Charts/MagnitudeZ.py from PyQt5 import QtWidgets, QtGui
Charts/Capacitance.py from PyQt5 import QtWidgets, QtGui
Charts/VSWR.py from PyQt5 import QtWidgets, QtGui
Charts/RI.py from PyQt5 import QtWidgets, QtGui
Charts/GroupDelay.py from PyQt5 import QtWidgets, QtGui
Charts/Permeability.py from PyQt5 import QtWidgets, QtGui
Charts/CLogMag.py from PyQt5 import QtWidgets, QtGui
Charts/LogMag.py from PyQt5 import QtWidgets, QtGui
Charts/QFactor.py from PyQt5 import QtWidgets, QtGui
Charts/Square.py from PyQt5 import QtWidgets, QtGui
Charts/Inductance.py from PyQt5 import QtWidgets, QtGui
Charts/Frequency.py from PyQt5 import QtWidgets, QtGui, QtCore
Charts/Chart.py from PyQt5 import QtWidgets, QtGui, QtCore
Charts/TDR.py from PyQt5 import QtWidgets, QtGui, QtCore
Charts/Chart.py from PyQt5.QtCore import pyqtSignal
Marker/Widget.py from PyQt5.QtCore import pyqtSignal
Widgets/SweepControl.py from PyQt5.QtCore import pyqtSignal
SweepWorker.py from PyQt5.QtCore import pyqtSlot, pyqtSignal
Settings.py from PyQt5.QtCore import QModelIndex
Analysis/PeakSearchAnalysis.py from scipy import signal
Calibration.py from scipy.interpolate import interp1d
Touchstone.py from scipy.interpolate import interp1d
Hardware/Hardware.py from serial.tools import list_ports
__main__.py import argparse
Windows/TDR.py import scipy.signal as signal
