Instead of Growl, consider Snarl. I found that it works as well, if not better, and is actively developed, where Growl seems to have stagnated. Growl also hijac

Instead of Growl, consider Snarl. I found that it works as well, if not better, and is actively developed, where Growl seems to have stagnated. Growl also hijacks an important Emacs hotkey. Personally I'd like to see Snarl/Growl integrate with the new Notifications center in Windows 10. This way you could have applications written for Windows and other Operating Systems share a common notifications API that is exposed through native implementations on each OS.