Free
OpenSilver
OpenSilver is an open source framework that allows developers to run Silverlight applications in modern web browsers using WebAssembly, eliminating the need for plugins and enabling legacy app modernization.
Free
Capacitor
Capacitor is an open-source native runtime that enables developers to build cross-platform mobile, desktop, and web applications using a single codebase with web technologies, providing access to native device features via plugins.