"D-Bus is a message bus system, a simple way for applications to talk to one another." [1] It's particularly popular on free software desktops (Gnome, KDE). HDBus wraps the DBus APIs so your Haskell code can broadcast messages and make calls to services. For example, on my recent Ubuntu system, these bindings are sufficient to pop up balloon-tip-style notifications via a daemon I wasn't previously aware of. Very preliminary code, so please let me know if you find it useful. (Also, I don't know where it's appropriate to announce this, so please direct me to other mailing lists.) Home page: http://neugierig.org/software/hdbus/ Haddock: http://neugierig.org/software/hdbus/doc/ Repository browser: http://neugierig.org/software/darcs/browse/?r=hdbus;a=summary [1] http://www.freedesktop.org/wiki/Software/dbus