I'm searching for a good Twitter application for Windows 8.

Requirements:

 - Runnable under Microsoft Windows 8 (obviously ;-))
 - Ideally runnable on Windows 10 too, as it will be released soon
 - Aware of multiple accounts (whether if I need to change the current user scope or if I'm able to select which I want to use for the next tweet)
 - Show all Twitter related stuff like mentions, messages, etc.
 - Metro awareness is nice to have
 - Ideally actively developed, as I won't change the application after the next API change