I have a couple of SaaS products: Belt drive design tools for companies in the mechanical power transmission industry, and dealership management software for manufactured housing ("mobile home") retailers.

Back end:

- Windows Server 2012 - MS SQL Server - ASP.NET - Web API 2 - C# - Dapper "micro ORM" (I dislike heavy ORMS and would rather write my own SQL)

Front end: - Bootstrap - jQuery - DataTables (https://datatables.net/)

I use these "boring" things because I'm familiar with them from contract programming work for companies where Microsoft stuff is common.