fpGUI, the Free Pascal GUI toolkit, is a cross-platform graphical user interface toolkit developed by Graeme Geldenhuys. fpGUI is open source and free software, licensed under a Modified LGPL license. The toolkit has been implemented using the Free Pascal compiler, meaning it is written in the Object Pascal language.fpGUI consists only of graphical widgets or components, and a cross-platform 2D drawing library. It doesn't implement database layers, 3D graphics, XML parsers etc.