Open source tasks app that syncs automatically with Google Tasks? Now that there is an API for Google Tasks (tasks in Calendar), do you know a tasks app with the following features?


Automatic sync with Google Tasks
Open Source
Works offline too.
Minimalist (same featureset as Google Tasks, plus widget maybe)
A new task can be added very quickly, without having tens of inputs to enter deadline/assignee or anything that is not available in Google Tasks anyway.
Available for my poor Android 1.5 phone
I think Astrid is open source but you might want to check better because I'm not sure.