Share your favorite Windows 8 app

[iSmart]

What is you preferred Windows 8:
1) App.
2) Game.

Let's share the best of them here :P

 

[Endless]

qbittorrent - ultimate torrent client (ads free, cross platform, open source), I hate the bloated utorrent.
skype (for desktop) - the win8 version sucks worse than a vacuum cleaner