Open source releases from Microsoft
ML.NET is an open source and cross-platform machine learning framework for .NET.
Blazor is an experimental .NET web framework using C#/Razor and HTML that runs in the browser with WebAssembly
Original Windows File Manager (winfile) with enhancements
Azure Data Studio is a data management tool that enables working with SQL Server, Azure SQL DB and SQL DW from Windows, macOS and Linux.
A starter template for TypeScript and React with a detailed README describing how to use the two together.