Open DBDiff - A database comparison tool for Microsoft SQL Server 2005+ that reports schema differences and...
DBComparer - Free Compare database tool - DBComparer 3.0 is a professional compare database tool for comparing Microsoft SQL Server 2008 (and 2005) database structure.
MssqlMerge - MssqlMerge is an easy to use diff & merge tool for Microsoft SQL Server databases.
Redgate SQL Data Compare - Use Redgate SQL Data Compare to compare and synchronize static, lookup, and reference data in your SQL Server database - try it free
Replicator - Easily replicate database table data - even with heterogeneous databases.
DataWeigher - The DataWeigher is the tool to compare and synchronize data.