Your Project Management/Online Collaboration Tools Expedition Guide!

AceProject.com

Free for fairly basic web-based facilities (less than 50 tasks per project) with options for more if you're prepared to pay. Not the most intuitive (export/import a bit difficult to find!).

Centripetal Basecamp Backup

Centripetal Basecamp Backup allows you to maintain control of your critical business data by retrieving a complete back up of your files, application data, or application database from 37 Signals Basecamp online application.

Intervals

A hosted service that enables you to centralize and manage your projects, streamline your tasks, and track time in a personalized online space. This application generates timesheets, reports and invoices and calculates real-time budget vs. the actual budget. Also, you can upload documents and files pertaining to specific projects and assignments.

5pm

5pm is the new version of the project management tool we've been using for years. The customizable interface was designed to make the maximum use of screen space, and everything is within a click or two. Check the visual timeline for an alternative view of your projects/tasks.

Central Desktop

10x the horsepower of Basecamp, just as simple and without the attitude. Central Desktop - Team/Project Tools that just work.

LiquidPlanner

LiquidPlanner is online project management software that offers teams a project environment with social networking features. Free during initial beta period.