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It's a mobile UI framework for creating Android and iOS applications from the same code base.

Here is a good introductory video: https://www.youtube.com/watch?v=fq4N0hgOWzU

And the UI engine on Fuchsia.

Won’t these apps end up looking and feeling like Android apps and be out of place on iOS?

Flutter has the builtin ability to mimic platform conventions (Android on Android, iOS on iOS), which includes scrolling, animations, fonts, etc.

If you have an Android phone you can download Flutter Gallery app from Play Store, go to the menu and flip behavior from Android to iOS. Suddenly you have an app that behaves like an iOS app. Here is a demo like that from the early days: https://youtu.be/Mx-AllVZ1VY?t=11m23s

Flutter is a mobile SDK from Google for building UIs using Dart. Dart is a programming language from Google, initially designed to replace Javascript. It's optionally typed and fixes many JS annoyances.

https://flutter.io https://www.dartlang.org/

Dart 2.0 is strongly typed with inference.

Now it allows for AOT and JIT on its Compiler Toolchain.

And not a single link either. Might as well have been in a book.