Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.

instashare - Share your photos to instagram from your mac

Nubo - A self-hosted file sharing application in Haskell.

Frame.io Watch Folders - Accelerated, secure, & indestructible uploading to Frame.io

4sync - A wonderful application that links all of your computers and mobile devices together. Easiest way to back up and sync your files online. Cross platform file management in the cloud

Pushbullet - Pushbullet - Your devices working better together