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

Changes:

* Set the progress of your tasks
* Google Now integration
* New date and timepicker
* Audio records
* More task templates
* Multi-Account handling
* Caldav-Sync via davdroid
* Auto backup
* Added portuguese, dutch and arabic translation
* Dynamic Task Fragment
* And many more awesome stuff

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