| [x265](https://x265.org/) | x265 is a free software library and application for encoding video streams into the H.265 AVC compression format, and is released under the terms of the GNU GPL. |
| [xprop](https://www.x.org/wiki/) | The xprop utility is for displaying window and font properties in an X server. One window or font is selected using the command line arguments or possibly in the case of a window, by clicking on the desired window. A list of properties is then given, possibly with formatting information. |
| [Xvfb](https://www.x.org/releases/X11R7.6/doc/man/man1/Xvfb.1.xhtml) | Xvfb is an X server that can run on machines with no display hardware and no physical input devices. It emulates a dumb framebuffer using virtual memory. |
