iotlist - Discover the internet of things
Flatfile - The new standard for data import
Fieldbook - Create a database, as easily as a spreadsheet
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly