vgrabbj is a program that will grab an image from a v4l compatible device (usually a webcam of some sort) and save it in a jpg or png file.

The High Performance Computing (HPC) Challenge benchmark runs a suite of 7 tests that measure the performance of CPU, memory and network for HPC clusters. Amongst others, it includes the High-Performance LINPACK (HPL) benchmark, used by the Top500 ranking (http://www.top500.org/).

This GNOME Shell extension provides an icon which can be toggled to inhibit the actions that would normally be taken when the system is idle, including screen locking, screensaver and automatic suspend. By default it also inhibits idle actions while any window is full-screen, and it can be configured to inhibit idle actions while user-specified applications have any window open.

Guacamole is an HTML5 web application that provides access to a desktop environment using remote desktop protocols. A centralized server acts as a tunnel and proxy, allowing access to multiple desktops through a web browser. No plugins are needed: the client requires nothing more than a web browser supporting HTML5 and AJAX.