It's just a simple script that check for the package.json for selected MFEs and it then outputs two main thing:

find_common_packages.py

import os
from urllib import request
import json

MFES = ['frontend-app-account','frontend-app-gradebook','frontend-app-profile','frontend-app-learning']
GITHUB_PERFIX = 'https://raw.githubusercontent.com/openedx/'
BRANCH = 'master'

def get_package_json():
    for mfe in MFES:
        if os.path.isfile(mfe+'_package.json'):
            continue
        request.urlretrieve(render_url(mfe),mfe+'_package.json')

def find_shared():
    all_depens=[]
    for mfe in MFES:
        f = open(mfe+'_package.json','r')
        depn=json.loads(f.read())['dependencies']
        all_depens.append(depn)
    shared_strict = [{t[0]:t[1]} for t in (set.intersection(*(set(d.items()) for d in all_depens))) ]
    shared = set.intersection(*(set(d.keys()) for d in all_depens))
    save_json(list(shared),'shared')
    save_json(shared_strict,'shared_strict')


def save_json(data,path):
    with open(path+".json","w") as outfile:
        json.dump(data,outfile)

def render_url(mfe):
    return(GITHUB_PERFIX+mfe+'/'+BRANCH+'/package.json')

get_package_json()
find_shared()

shared.json

["@edx/frontend-platform", "redux", "@edx/paragon", "regenerator-runtime", "react-redux", "@fortawesome/free-solid-svg-icons", "@fortawesome/free-brands-svg-icons", "react-router-dom", "@edx/frontend-component-header", "prop-types", "react-dom", "react-router", "@fortawesome/fontawesome-svg-core", "@edx/brand", "@edx/frontend-component-footer", "react", "@fortawesome/react-fontawesome", "classnames", "core-js"]

shared_strict.json

[{"prop-types": "15.7.2"}, {"@edx/frontend-component-footer": "10.1.6"}]