Cairo Vector Graphics Library
Cairo is a vector graphics library designed to provide high-quality display and print output.
Currently supported output targets include the X Window System, OpenGL (via glitz), in-memory image buffers, and image files (PNG and PostScript). Initial work has begin on support for PDF file output. Cairo is designed to produce identical output on all output media while taking advantage of display hardware acceleration when available (eg. through the X Render Extension or OpenGL).
Cairo provides a stateful user-level API with capabilities similar to the PDF 1.4 imaging model.
Cairo provides operations including stroking and filling Bezier cubic splines, transforming and compositing translucent images, and antialiased text rendering. Cairo was once named Xr, (or Xr/Xc), so if you came looking for that software, you've found it. Cairo is a free software library released under the MIT license.