Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
Apache UserGrid - Usergrid is an open-source BaaS enabling developers to rapidly build web and/or mobile applications.
Microsoft PowerApps - Microsoft PowerApps provides tools to create, customize, share and run apps.
AWS Amplify - JavaScript library for app development using cloud services
Retool - Build custom internal tools in minutes.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.