From the Store description:
The first independent application (unofficial), 100% free with no advertising, dedicated to the Rugby World Cup 2015, exclusively developed for Windows Phone.
Teams, results, agenda ... all relevant information for tracking the major competition in 2015.
By connecting your Twitter account, follow news and interact with the teams.
Clearly a labour of love from the developer, here's the application in action:
There's a nice touch wherein you get to pick a favourite team to follow and then some of the functionality is centred around that team. Everything's beautifully presented in a panorama/Metro-style interface.
Core to the application, of course, is keeping up with the fixtures and results. Obviously none of the latter are in yet, but in the meantime you can check out what others are saying on official Twitter feeds and even (via Settings) connect your own Twitter account in order to get involved without leaving this application.
How do you think England will do then? Wales and the Aussies will be tough as always! And looks like South Africa and Scotland will romp through Pool B?
Grab Rugby World Cup here in the Store - it's excellent. And remember to buy the developer a beer!