libcairo: Cairo provides anti-aliased vector-based rendering for X
Cairo is a 2D graphics library with support for multiple output devices.
Currently supported output targets include the X Window System, win32, and image buffers.
Experimental backends include OpenGL (through glitz), Quartz, XCB, PostScript and PDF file output.
Cairo is designed to produce consistent output on all output media while taking advantage of display hardware acceleration when available (for example, through the X Render Extension).