Showkeys is a simple program to display keys being pressed on the screen. It is useful while making presentations and screencasts. The audience will be able to see the keys being pressed. It is similar to key-mon. Key-mon has more features than showkeys. but the latter solves some specific problems: it doesn't use GTK/GNOME; uses libxosd to display keys directly onto the screen; has no floating windows to that always need to be on top (which is very useful if you're using a tiling WM like Xmonad); and has keystroke history. key-mon has keystroke history, but doesn't show modifiers. showkeys does, using an Emacs style key notation.
Screencast makes it easy to produce high-quality screencasts on Linux with support for JACK Audio and updates in full detail. It is indispensable for recording video tutorials, video logs, and other computer activity, and works especially well with audio applications such as Pd, Ardour, and chuck. It is multi-threaded and produces smooth results with no jittery sound or loss of fine detail in screen updates.