>> wxWidgets licence is a modified version of LGPL explicitly allowing not distributing the sources of an application using the library even in the case of static linking.
https://github.com/wxWidgets/wxWidgets
runs native on the following platforms:
- wxGTK: The recommended port for Linux and other Unix variants, using GTK+ version 2.6 or higher.
- wxMSW: The port for 32-bit and 64-bit Windows variants including Windows XP, Vista, 7, 8 and 10.
- wxOSX/Cocoa: For delivering 32-bit and 64-bit Cocoa-based applications on macOS 10.7 and above.
- wxQt: wxQt is a port of wxWidgets using Qt libraries. It requires Qt 5 or later.
- wxX11: A port for Linux and Unix variants targetting X11 displays using a generic widget set.
- wxMotif: A port for Linux and Unix variants using OpenMotif or Lesstif widget sets.
Bindings are available for C++ and python
Window Layout Using Sizers
Device Contexts (along with pens, brushes and fonts)
Comprehensive Event Handling System
HTML Help Viewer
Sound and Video Playback
Unicode and Internationalization Support
Document/View Architecture
Printing Archiecture
Sockets
Multithreading
File and Directory Manipulation
Online and Context-Sensitive Help
HTML Rendering
Basic Containers
Image Loading, Saving, Drawing and Manipulation
Date-Time Library and Timers
Error Handling
Clipboard and Drag-and-Drop
[0] https://github.com/wxWidgets/wxWidgets