Zoho Projects is an online web based project planning / collaboration management software tool that helps get your projects done faster.
"Best for multiple project visualizations" according to TechRepublic.
SpecsUpdate
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Pros
Pro Document management features
Share text files, spreadsheets, presentations and other documents associated with your team and work on them together. A version control system makes sure that everyone has access to the latest copy.
Pro Has mobile apps
With native apps for iPhone, Android and iPad, you can continue to plan your project activities, assign work, manage resources, log time and access documents even as you are away from your desk.
Pro Has a built-in bug tracker
Log bugs and track them as they get fixed and tested. Define custom workflows and business rules. Track code changes made in GitHub and Bitbucket.
Pro Free version
Free for up to 3 users.
Pro Supports project pages
Pages help you create a centralized searchable information repository for your projects. They can be used as an intranet to publish company links, documents, announcements and events.