Sql schema comparing software: Compare and merge SQLite schema and data!, Compare/synchronize two MS SQL databases, Schema Version Control for Oracle (SVCO) and more.
dbForge Schema Compare for SQL Server is a reliable, easy-to-use tool to compare and synchronize structures of Microsoft SQL Server databases. This product is specially designed to help you quickly analyze database structure differences at a glance and propagate the changes to a required SQL Server escaping tedious manual work.
DBComparer is a professional database tool for comparing Microsoft SQL Server 2008 (and 2005) database structure. It is an excellent tool for any project development team or DBA's managing multiple copies of the same database on SQL Server. It's uniquely build user interface will bring you the best visual representation of differences and will give you the best way of discovering and eliminating differences.