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Open DBDiff is an open source database schema comparison tool for SQL Server 2005/2008.
It reports differences between two database schemas and provides a synchronization script to upgrade a database from one to the other.

Don't miss a year's worth of updates ready for testing: Open DBDiff 0.9



Open DBDiff can synchronize

• Tables (including Table Options like vardecimal, text in row, etc.)
• Columns (including Computed Columns, XML options, Identities, etc.)
• Constraints
• Indexes (and XML Indexes)
• XML Schemas
• Table Types
• User Data Types (UDT)
• CLR Objects (Assemblies, CLR-UDT, CLR-Store Procedure, CLR-Triggers)
• Triggers (including DDL Triggers)
• Synonyms
• Schemas
• File groups
• Views
• Functions
• Store Procedures
• Partition Functions/Schemes
• Users
• Roles

I didn't find any tool like this 100% open source for SQL Server. It does not depend on any privative tool or component. I do its work without resorting to SMO.
We tested this tool with more than 100 distinct testing use cases.