[exceltrading]

There definitely is for excel. Both for consumer add-ins and internal business add-ins. I've thought about it, and even started on the idea a few times, but have given up. There are just so many components of the system that are outside of your control as a developer. Someone with the appropriate resources might be able to do something neat.

[pi3rre]

I thought about developing a simple Google Sheets add-on but I've been put off by Google verification process because of the scopes I use.