CardDAV-Sync is available at Google Play.
For those who don't have a credit card or don't want Google to have it's number:
CardDAV-Sync has been approved by Silent Circle and is available in the Silent Store on Blackphone devices.
CardDAV-Sync is available at Amazon.
Need more than 50 licences for your company or organisation? Contact me!
Alternatively download CardDAV-Sync 0.4.5 free beta