Basecamp is a web-based project management tool. You can use it to collaborate with clients on projects. Set deadlines, assign tasks, share project files, discuss project details, and manage multiple projects at the same time. Over 2,000,000 people have Basecamp accounts.

Backpack is an intranet and group calendar tool. It takes just 30 seconds to get started. Use Backpack to share information, knowledge, files, schedules, to-do lists and more inside your organization. Post company-wide announcements too. PC World calls it "Tremendous."

Highrise is a contact manager and CRM tool. Use it to keep track of who you talk with, what was said, and what to do next. Log notes from conversations with customers, leads, vendors, or anyone you do business with. Set follow-ups, call backs, and thank you note reminders.