Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
Microsoft PowerApps - Microsoft PowerApps provides tools to create, customize, share and run apps.
Flatfile - The new standard for data import
Retool - Build custom internal tools in minutes.
restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.