Enhanced_growl is a project mainly written in Perl, it's free.
TTYtter enhaced growl notifications
A TTYtter extension for Enhanced Growl Notifies.
It adds a new Application to the Growl "Applications" tab named "TTYtter enhanced Growl". You can configure and customize each of the different notification types that TTYtter provides. These are: default, dm, me, reply, search.
Enhanced Growl activates by default "dm" and "reply".
To run it you need to:
Load the extension: Simply load it adding -exts="/path/to/enhanced_growl.pl" to your ttytter invocation.
Specify the notifications driver: Add after loading the extension!! Add -notifytype=enhanced_growl to your ttytter invocation
Putting it all together: -exts="/path/to/enhanced_growl.pl" -notifytype=enhanced_growl
I have not tested this code with anything but my own setup. If you do run it and encounter problems, I'd love to hear about it.