I had already posted here about two months ago. At the time, the name of my product was "Xamarin Forms Live" But due to branding issues I had to rename it to LiveXAML, which to me is an even better name since it better reflects the functionality.
What is LiveXAML?
LiveXAML is a Visual Studio extension + NuGet package. After installing both, you will be able to develop your user interface while the application is running in the emulator. Note, that LiveXAML is not a previewer, which differs it from other UI development tools. LiveXAML actually updates your live application whenever you modify a XAML file.
Updating live application means that LiveXAML does not restrict you with library usage or anything else. Whatever you use in your app stays the same, which also means that LiveXAML doesn't require any configuration besides initial installation.
Project site: www.livexaml.com