download-chromium is a web application running on Google App Engine that lets you download the last Chromium builds for Windows, Mac, Linux, Chrome OS and Android.
You can find the official Google App Engine instance at https://download-chromium.appspot.com
Bonus #1: This web application is officially listed on https://www.chromium.org/getting-involved/download-chromium
Bonus #2: Go learn differences between Chromium and Google Chrome at https://chromium.googlesource.com/chromium/src/+/master/docs/chromium_browser_vs_google_chrome.md
gcloud config set project download-chromium
gcloud app deploy --project download-chromium