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