You can view the apps that can be installed on the Sky TV-Stick from the Google Play Store.
If you want to install applications on your Sky TV-Stick, first access the Home menu by pressing the HOME button on the remote control.
Scroll down to the Apps menu and select the Google Play Store icon.
You will then access the Google application store: Google Play, where you can search for applications, then download and install them on your Sky TV-Stick.