my minimal bower replacement: just download the package.json (or copy the script over to yours) and hit "npm install".

nodep package.json

{
  "name": "bower-replacement",
  "version": "0.0.1",
  "description": "bower replacement made simple (noDep)",
  "scripts": {
    "postinstall":"npm link download && node -e \"require('./package.json').download.forEach(a => require('download').apply(0,a))\" && npm unlink download"
  },
  "download": [
    ["https://gist.github.com/favicon.ico","."],
    ["https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.js","src/script/org"],
    ["https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css","src/style/org"],
    ["https://google-webfonts-helper.herokuapp.com/api/fonts/roboto?download=zip&subsets=latin&variants=100,300,500,700,900,regular","src/style/fonts",{"extract":true}]
  ]
}

package.json

{
  "name": "bower-replacement",
  "version": "0.0.1",
  "description": "bower replacement made simple",
  "scripts": {
    "postinstall":"node -e \"require('./package.json').download.forEach(a => require('download').apply(0,a))\""
  },
  "download": [
    ["https://gist.github.com/favicon.ico","."],
    ["https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.js","src/script/org"],
    ["https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css","src/style/org"],
    ["https://google-webfonts-helper.herokuapp.com/api/fonts/roboto?download=zip&subsets=latin&variants=100,300,500,700,900,regular","src/style/fonts",{"extract":true}]
  ],
  "devDependencies": {
    "download": "^6.2.0"
  }
}