PageLayout is a layout lanager for Java Swing/AWT that encapsulates, in a single library, the functionality of many other layout managers. It allows you to lay out components in appropriately aligned rows, columns, and grids. The elements of rows, columns, and grids may themselves be rows, columns, and grids of components. As a result, relatively complex layouts can be managed with code that is compact and conceptually quite straightforward to understand and, therefore, maintain.
Faith is a cross-platform C++ graphical application toolkit. It runs natively on Linux/Unix (Xlib) and Windows. It has an API strongly inspired by Qt's and has many features that are expected from a modern toolkit, including a variety of common "widgets", an aesthetically pleasing appearance, and the many critical non-portable components such as anti-aliasing and sockets.
Minimal OpenGL Utility Library (MOGUL) is a library similar to GLUT, only with fewer features. It lets you write window-system-independent OpenGL programs with even fewer lines of code than GLUT. It currently supports X11 and Win32. Examples are included in the distribution. It is intended to be easy to learn and simple to use.