DirectFB
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DirectFB is a computer library for Linux operating system that provides "hardware graphics acceleration, input device handling and abstraction, integrated windowing system with support for translucent windows and multiple display layers on top of the Linux Framebuffer Device." [1] (http://www.directfb.org/)
The library allows developers to bypass the X Window System, which has been traditionally used to support graphics in UNIX and the like, to speed up and simplify graphic operations by allowing applications to talk directly to video hardware with a thin simple API.
LinuxTV [2] (http://www.linuxtv.org/) uses DirectFB.