Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Retool - Build custom internal tools in minutes.
Flatfile - The new standard for data import
SeaTable - With SeaTable, teams can easily organize their tasks, assets, projects and ideas. It looks like Excel, but its not limited by text and numbers. SeaTable brings structure to any type of information, in the cloud or on your own server.
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly