Hi Kolya,
Here is my C++ GUI library based on Boost, it - is cross-platform - uses native system-provided widgets - has STL-like and Boost-like API - compatible with other Boost libraries - supports modern C++11/14/17 features […]
I looked at the code examples, which look neat. I also like the goal to have a cross-platform C++ lib for GUIs, but isn't an UI library too elaborate/invested for Boost? I am quite familiar with Qt and its a huge library, and yet it is moving fast to keep up with new trends. You would need a lot of active and dedicated developers to keep up and provide similar amounts of features. Some people here probably shiver at the thought how Qt distorted C++ get things done, introducing its own preprocessor and missing language features in a non-standard way. I am not a fan either. And still, Qt is easy to work with and the documentation is outstanding. With KDE it has a large user base, too. It is hard to beat such competition. Just my 2 cents. Hans