Collabtive is an open source project management application. Collabtive was initialy released in 2007. Collabtive is an open source alternative to proprietary tools like Basecamp. Collabtive is intended for small to medium-sized businesses and freelancers.

Core functionality:

• Unlimited projects, milestones, tasklists, and tasks
• Unlimited members with user profiles
• Role-based permission management
• Messaging and instant messaging
• File management
• Timetracking

Reporting and notifications:

• Timetracker reports, activity logs and messages in PDF format
• Export user profiles as vCard
• RSS feeds for messages and tasks
• Synchronization of calendars via iCal task export
• Excel files from activity logs and timetracker reports
• E-mail notifications

Other:

• Search, tags
• Basecamp import
• Fully themeable
• Available in more than 35 languages
• Full UTF8 support

Collabtive is developed by a team of professional volunteers. Everyone involved is a pro in their respective areas, providing high quality contributions to the project.