Freedesktop.org libraries

GStreamer is a pipeline-based multimedia framework that links together a wide variety of media processing systems to complete complex workflows. For instance, GStreamer can be used to build a system that reads files in one format, processes them, and exports them in another. The formats and processes can be changed in a plug and play fashion.

Pango (stylized as Παν語) is a text (i.e. glyph) layout engine library which works with the HarfBuzz shaping engine for displaying multi-language text.

graphics-related software library

free software PDF rendering library

Fontconfig is a free software program library designed to provide configuration, enumeration and substitution of fonts to other programs. Fontconfig was originally written and maintained by Keith Packard, and is currently maintained by Behdad Esfahbod.

thumb|X11-clients use XCB to communicate with the display server|X server. thumb|A more complete view of the Linux graphics stack thumb|Programs often use GTK or [[FLTK or Qt for their GUI widgets.]] thumb|A more complete view of the components of an operating system for home computers.