What cloud applications are most useful for a contracting company?

What type of Cloud Applications do you find are most useful for a small general contracting company.
(I.E. Evernote,Dropbox,Box)

We’re not exactly a small general contracting company but I can tell you at BuildZoom, we’ve found Evernote and Dropbox to be really helpful for just day-to-day stuff. Slack and Trello have also become really helpful in terms of organizing our efforts.

I actually think Trello would be a reasonable application to use with contracting clients - to keep them in the loop on how a project is moving along. Slack would be a little less helpful to a contractor imo.

I’m probably a bit unorthodox, but I’m a big fan of Microsoft Excel in conjunction with Onedrive. I keep all my day-to-day notes, to do lists, project logs, etc on one workbook so when I save I have it on all my devices.