GNUstep is a set of general-purpose Objective-C libraries based on the OpenStep standard developed by NeXT (now Apple) Inc. The libraries consist of everything from foundation classes, such as dictionaries and arrays, to GUI interface classes such as windows, sliders, buttons, etc. In the new 0.8 version, the graphics/window interface was completely revamped. New functionality was added to make things faster and eventually implement Quartz compatibility. There is now a window server backend for Windows computers, although it is in a very alpha state. The most important applications written in GNUstep so far are the GNUstep Workspace and the GNUstep Mail Application.