[davedx]

Google Sheets uses JavaScript as its scripting language. The problems I've had there are related to how complicated it is to get data in and out of Sheets. If you want to update a sheet you own, you need to do a full blown OAuth2 implementation.

[mmckelvy]

Excel has an JavaScript API now as well right? At least I heard rumblings to that effect. Not sure how hard / easy it is to get data into / out of though.