IMAGINARY is your place for open and interactive mathematics. -- Programs are software modules that can be used at home, in schools, at exhibitions or in museums. They all work on standard hardware and have special settings and specifications for public installations, like kiosk mode, touch screen interface or support for novel hardware devices. The programs are the core element of this platform, visually attractive and highly interactive, enabling you to explore and to create mathematics. -- Galleries are the visual heart of the platform. They feature images created by mathematicians and artists. All pictures should contain a mathematical description of their content and any necessary files attached to reproduce them – be it high resolution pictures, equations behind them or source files for visualization programs.