transset-df is a heavily patched version of xorg's transset. It is used to set the transparency of windows in X with the xcomposite extension. It adds several command line options to make it easier to use directly, bound to hot keys in your window manager, or through scripts. These include the ability to select a window by window ID.
Felidae is a collection of modules for Fvwm. FvwmStorage lets you define variables, load and store them from/to files, and execute any fvwm command using them. It is especially useful to interactively change the fvwm configuration. FvwmWallpaper lets you change your X wallpaper from within Fvwm. It tries to find the best way to display your picture and resizes it if necessary. FvwmXMMS lets you control XMMS by sending commands to this module. FvwmOsd lets you display an on-screen display on your X display. FvwmOsd is organized in different "channels", each of which you can configure and use independently of the others.
Terminal is a modern terminal emulator for the Unix/Linux desktop, primarly for the Xfce desktop environment. It was developed because Xfce needed a lightweight and easy-to-use terminal emulator that didn't require the user to install the GNOME libraries, but still provided a worthy alternative to the GNOME terminal emulator, with all the bells and whistles.