dnkl 
Sigh, hedwig *will* be renamed to something else. Something that doesn't already exist.
Haven't decided what yet; it's surprisingly hard to find a meaningful name that isn't already in use...
Looking at repology.org, here are a couple of suggestions that are free
* notebox
* notify-me
* noteit
* cli-notify
* notifly
Mark Stosberg@dnkl Or pre-empt systemd: notifyctl