Create basic bungeecord setup easy!

bungeecord-create.py

import sys
import os
import requests
import subprocess as sp
import shutil
import time

BUNGEECORD_LATEST = 'https://ci.md-5.net/job/BungeeCord/lastSuccessfulBuild/artifact/bootstrap/target/BungeeCord.jar'
BUILDTOOLS_LATEST = 'https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar'

BUILDTOOLS_DIRNAME = '_Buildtools'
BUNGEECORD_DIRNAME = 'Bungeecord'

RUN_SCRIPT = 'java -DIReallyKnowWhatIAmDoingISwear -jar -Xmx{0}G -Xms{1}G {2}'

def downloadTo(url, fp):
    res = requests.get(url)
    with open(fp, 'wb') as f:
        f.write(res.content)
        f.close()

class Logger:
    def info(message):
        print(f"[Info] {message}")

    def warn(message):
        print(f"[Warn] {message}")

    def err(message):
        print(f"[Error] {message}")

if __name__ == '__main__':
    action = sys.argv[1]
    root_dirname = sys.argv[2]
    server_type = 'spigot'
    server_ram = sys.argv[3]
    server_names = sys.argv[4:]

    log = Logger
    if action == 'new':
        log.info('Setting up...')
        os.mkdir(root_dirname)
        buildtools_path = os.path.join(os.getcwd(), root_dirname, BUILDTOOLS_DIRNAME)
        buildtools_jar_path = os.path.join(buildtools_path, 'BuildTools.jar')
        os.mkdir(buildtools_path)
        bungeecord_path = os.path.join(os.getcwd(), root_dirname, BUNGEECORD_DIRNAME)
        bungeecord_jar_path = os.path.join(bungeecord_path, 'Bungeecord.jar')
        os.mkdir(bungeecord_path)
        log.info('Downloading Bungeecord...')
        downloadTo(BUNGEECORD_LATEST, bungeecord_jar_path)
        log.info('Downloadig BuildTools...')
        downloadTo(BUILDTOOLS_LATEST, buildtools_jar_path)
        log.info('Generating server folders...')
        server_dir_paths = []
        for server_name in server_names:
            p = os.path.join(os.getcwd(), root_dirname, server_name)
            os.mkdir(p)
            server_dir_paths.append(p)

        log.info('Running BuildTools...')
        os.chdir(buildtools_path)
        bt_proc = sp.run(['java', '-jar', 'BuildTools.jar'])
        log.info(f'Done. Setting up {server_type} servers...')
        spigot_jar_path = None
        for filename in os.listdir('.'):
            if 'spigot' in filename:
                spigot_jar_path = os.path.join(buildtools_path, filename)
                log.info('Found spigot jar...')
                log.info(spigot_jar_path)
                break
        if not spigot_jar_path:
            log.err('Error finding spigot jar file. Aborting.')
            sys.exit()

        os.chdir('..')
        log.info('Copying server jar to each server...')
        log.warn('BY CREATING A MINECRAFT SERVER YOU AGREE TO MOJANGS EULA')
        for server_dir in server_dir_paths:
            fp = shutil.copy(spigot_jar_path, server_dir)
            time.sleep(3)
            os.rename(fp, os.path.join(fp, 'spigot.jar'))
            log.info('Copied to ' + server_dir + ', creating start script..')
            with open(os.path.join(server_dir, 'run.sh', 'w')) as f:
                f.write(RUN_SCRIPT.format(server_ram, server_ram, server_type + '.jar'))
                f.close()
            with open(os.path.join(server_dir, 'eula.txt', 'w')) as f_eula:
                f_eula.write('eula=true')
                f_eula.close()
        print('Finished setting up ' + len(server_names) + ' ' + server_type + ' servers.')
        print('Goodbye :)')
        sys.exit()

instructions.txt

Syntax goes as follows:
python bungeecord-create.py new <foldername> <ram in gb integer> <list of server names>

Will download the latest Bungeecord jar and BuildTools jar. Compiles spigot and creates new server instances for you to configure,
alongside a bungeecord folder of course :)