a:Drake is a freeware application for Android devices designed to do paperless Geocaching.
If you wonder where the name came from, here is explanation: cacher in czech sounds like “kačer” and it is duck male, i.e. drake
a:Drake is designed for off-line work, ie. without internet connection. It's possible to download data on-line, but this possibility is meant as a tool for quick update not as main way of program usage. Cache data is downloaded via Geocaching Live, it means, user has to be Premium Member to be able to use this feature without significant restrictions.
There is similar application PocketDrake running on Windows Mobile devices.