I have a number of projects and clients, all in various stages of production.

For each of them I need to track emails, meetings, and to-do lists. I also have documents, URLs, timesheets, and other financial documents associated with them.

I know about basecamp, but is there a free app or solution that integrates with my email (Gmail/Apple Mail), my calendar (Gcal/Apple Calendar), and even potentially my contact list (Apple Contacts).

There’s got to be something for this other than maintaining separate sets of tags. Anybody know?