I wrote a BlackBerry 10 app, after barely a week of owning a BlackBerry Z10! This is a re-implementation of the House4Hack openSHAC project, which is an app the opens and closes the gate and door at the House4Hack hackerspace in Centurion.
Instead of just porting the Android app, I re-implemented it using the BlackBerry Cascades framework (which uses C++, Qt and QML). This is mainly because the Android version uses the Google Play Services framework for authentication, so I needed to re-implement it to use OAuth.
This app is open source. You can view the code here: https://github.com/house4hack/openSHAC/tree/master/blackberry
Check out the app on BlackBerry World: http://appworld.blackberry.com/webstore/content/26269875/?countrycode=ZA