I have mentioned this already in a comment to @narthur’s beeminder journal, but I guess I should mention it here too: There is now a pretty simple beeminder integration for the taskwarrior task manager for the command line. 
It’s called beemind-hooks and written in node. The readme over there tells it all but I’ll at least mention the features:
- Map Beeminder goals to taskwarrior task descriptions and automatically beemind those
- Beemind completing your most urgent tasks (thanks @narthur!)
- Beemind completing tasks tagged with a certain tag
- Beemind completing tasks that fulfill a more complex export query