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