Use Qt write lunar calendar.
OpenDCL — modern dialog UI for AutoLISP.
Zoomable user interface (ZUI) with file manager, file viewers and more
An open process control and laser engraving software solution
High performance C++ library for building Wayland compositors
HP-41cx Emulator
Tao3D is a programming language for real-time interactive 3D
a CLI generator and and SW library
GTK+iostream, Data plots, ORB, Neural Networks, WSOLA
Widgets library contains c++ classes of GUI widgets for WinAPI.
QSS Skin Stylesheet
A Lua and XML Graphical User Interface
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
TISCH - Tangible Interaction Surfaces for Collaboration between Humans