From Webyog Softworks:
CloudMagic for Windows 8 put your mind at ease. It will find anything when you need it the most. Lightning fast search across Gmail, Facebook, Twitter, Dropbox, Evernote, and Box. With this app you can quickly find things when you need it the most like important email when a customer calls, the spreadsheet on the way to your meeting, airline ticket at the airport check-in desk, and restaurant your friend shared on your Facebook wall. It adds any number of accounts and search through all of them in one go. It allows you to quickly preview content and take common actions like open attachments, reply, forward, and retweet.