I'm pretty sure patio11 says on one of his blogs that anywhere anyone is using an excel file for important work is a SaaS waiting to be born.

edit: found it:

"My favorite symptom of an unmet need for software is any Excel spreadsheet which is ever updated by one employee, sent to a second employee, updated, and then sent back. Every time that happens a SaaS angel gets its wings."

https://training.kalzumeus.com/newsletters/archive/validatin...