Cloudmagic Free (Android & IOS)
By CloudMagic CloudMagic lets you harness the power of the cloud to its best. This app can search keywords across almost all popular cloud services like Google, Twitter, Facebook, Dropbox and Evernote. Just the ability to search across all your e-mail accounts makes this a great app. It also searches through your contact lists and docs, even better. Up to 50 uses a month are free.