I used to think C++/CX could finally be what would make Visual C++ actually Visual and comparable to C++ Builder, but the talks at BUILD and the exclusivity of C# even for HoloLens and Fluent Design demos shows that it failed to gain momentum, being mainly used by Microsoft to write low level code.
Windows, Mac, iOS, Android, Linux Server, cross-platform UI framework with native controls as well as native-themed ones. Runs on the GPU, vectorised, fast. Two languages, including C++ and Object Pascal (similar to C# in feel, but not C-style syntax.) Very large set of libraries for app development, server development, etc.