OpenSilver is described as 'Modern, plugin-free, open-source reimplementation of Microsoft Silverlight , that runs on current browsers via WebAssembly. It uses Mono for WebAssembly and Microsoft Blazor. It brings back the power of C#, XAML, and' and is an app in the development category. There are five alternatives to OpenSilver for Windows, Mac, Linux and JavaScript. The best OpenSilver alternative is Adobe Animate. It's not free, so if you're looking for a free alternative, you could try Ceylon or Jabaco. Other great apps like OpenSilver are KoolMoves and WebAnimator.