ZWM is an SDL-based window manager and widget library intended to be used in cross-platform applications. It features basic widgets like buttons, lists, containers, a file browser, combo-box, and many more. It also features support for mutimedia playback (MPEG, MP3, WAV, MIDI, Ogg, etc.).
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.