Mirakel by Anatolij Zelenin and Georg Semmler is an open source TODO-List App for Android.

Changes:

* New logo
* New UI
* Subtasks
* Add files to Tasks
* Configure your Semantic new Tasks
* Recurring Tasks
* Redesign settings
* New translations: norwegian, slovenian
* Sync with CalDAV
* Improved Taswkarrior-sync
* Help
* Bugfixes

https://play.google.com/store/apps/details?id=de.azapps.mirakelandroid