Are there any tools for making UI-based or email-based DEADLINE notifications in org-mode?
It'd be nice to convert org-mode's pull-based DEADLINE access (via C-c a a) into a push-based system :)
You can do this indirectly by exporting your org files to icalendar with C-c C-e c a
and loading the resulting ics file in Thunderbird or Google Calendar or some other calendaring tool. Most such tools can give notifications about deadlines.
For Thunderbird, import the file as a "on the network" calendar with a url of file:///path/to/calendar.ics
.
C-c a a
isn't a binding in vanilla org mode