Tustena offers many advanced features like:

• Company and Contact Management
• Lead Management
• Calendaring
• Tasks
• Notes
• Messages
• Opportunity Management
• Activity Management
• Advanced Search
• Charting
• Case / Solution Management
• Reporting
• Internationalization
• Companies, Contacts, leads and activity Import
• Advanced Reporting
• Product Catalog
• Email Marketing and Mailing Lists
• Mobile/WAP Access
• .Net WebServices
• Forecasting
• POP3 email manager via WebMail
• Voip Integration
• Microsoft Outlook Email Integration
• Desktop Alerter
• Quotes
• Knowledge Base
• Dynamic Databases
• Trouble Ticket Management
• Business Intelligence

Take a look at the commercial website for more details, or go directly to the sourceforge project page to download your copy!

Please note that support for the open source version is no longer provided as of 2008.