maybe a new fcitx.
Fcitx 5 is a generic input method framework released under LGPL-2.1+.
Cross-platform GUI management tools for OpenCore(OCAT)
C++ Functional Terminal User Interface.
Cross-platform modern c++ GUI
QtPass is a multi-platform GUI for pass, the standard unix password manager.
GitQlient: Multi-platform Git client written with Qt.
c++ testing framework