Invantive SQL - Invantive's custom SQL parser and processing engine is a feature-rich set of SQL statements...
Open DBDiff - A database comparison tool for Microsoft SQL Server 2005+ that reports schema differences and...
DbSchema - DbSchema - Visual Database Design & Management Tool
DBComparer - Free Compare database tool - DBComparer 3.0 is a professional compare database tool for comparing Microsoft SQL Server 2008 (and 2005) database structure.
dbForge SQL Complete - Try Intellisense functionality and Improved SQL Formatter in SQL Server Management Studio and Visual Studio using SQL Complete!
MssqlMerge - MssqlMerge is an easy to use diff & merge tool for Microsoft SQL Server databases.