IUP is a portable toolkit for building graphical user interfaces. It offers a configuration API in three basic languages: C, Lua and LED. IUP's purpose is to allow a program to be executed in different systems without any modification.

• Development Status: 5 - Production/Stable
• Environment: Win32 (MS Windows), X11 Applications
• Intended Audience: Developers
• License: Other/Proprietary License
• Natural Language: English
• Operating System: Windows, POSIX
• Programming Language: C, Lua 3, Lua 5
• Topic: Window Managers, Graphics, Software Development