• Balsamiq
  in Public bookmarks with gui interface tools by 3 users
• gameswf library -- free SWF player code, intended for game UIs
  gameswf (pronounced "game swiff") is an open source Public Domain library for parsing and rendering SWF movies, using 3D hardware APIs for rendering. It is designed to be used as a UI library for computer and console games.
  in Public bookmarks with development graphics gui
• Home - Pencil Project
  The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.
  in Public bookmarks with development editor gui by 7 users
• Scaleform Corporation
  Scaleform is currently creating an innovative new suite of software products, which range from scalable vector graphics (VG) and rich user interface (UI) engines to rapid visual development tools and services.
  in Public bookmarks with development graphics gui

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