https://www.indiehackers.com/interview/yet-another-mail-merge-3d1d726b51

https://chrome.google.com/webstore/detail/yet-another-mail-merge/mgmgmhkohaenhokbdnlpcljckbhpbmef

https://sites.google.com/site/scriptsexamples/available-web-apps/mail-merge/features

https://docs.handsontable.com/3.0.0/tutorial-quick-start.html