We use our own stack, based on ASP.net for the server side and standard HTML5 on the client. Our technology uses AOP techniques for Data Access on the server side and Data Binding in the browser.
We handle SQL Server, SQL Azure and Azure Storage. Apps build with our technology are Single page Apps so not suited for SEO. Our clients are mostly startups that need blazing agility for designing, developing and deploying their fully custom apps continuously without being concerned by technical details.
We are in the MV without C category because our product is a dynamic and universal controller. Our views are dynamic HTML template, and our models are Relational though we usually use NoSQL Azure Storage for persisting our data.