Calise grabs frames from a camera, returns "correct" screen backlight steps associated with them, and sets those values. It can be run with or without the Xorg environment, and on X comes with a pretty (optional) GUI.
Guvcview provides a simple GTK interface for capturing and viewing video from devices supported by the Linux UVC driver, although it should also work with any video4Linux2-compatible device.
A Grails 2 tag library that provides useful social media tags to include in Web pages.
A Websocket implementation in Qt.