"VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software."
qtHaskell is a set of Haskell bindings for the Qt Widget Library from Trolltech ASA. Haskell programmers can now access the Qt "Signals and Slots" interface logic, design interfaces using Qt Designer and write scripted applications using the Qt ECMA/Javascript engine.
GLFW is a free, Open Source, portable framework for OpenGL application development. In short, it is a single library providing a powerful, portable API for otherwise operating system specific tasks such as opening an OpenGL window, and reading keyboard, time, mouse and joystick input.