Siasto is a collaboration and project management tool that integrates into Google Apps, Gmail, Google Drive, GCal, box, and Dropbox. It's used by teams, SMBs, and enterprises to keep all their tasks, events, projects, and files in the same place. It allows users to create tasks, events, and documents all from the inbox. Siasto was started by the founders of Taskforce (http://taskforceapp.com) who's previous experience in task management led them to building Siasto. Siasto is backed by YCombinator and other angel investors.