Wunderlist

 Wunderlist  was an app for managing todo lists that Microsoft is shut down on 2020-05-06. It was available for many desktop and mobile platforms, and had an API.

How to export
(stub)

IndieWeb Examples

 * uses Wunderlist to write posts while offline, and sync them to his website later, using Wunderpub

History
Microsoft acquired Wunderlist in 2015. On 2017-04-19, they announced a preview of Microsoft To-Do and that they would eventually retire Wunderlist.