DabCoS

The purpose of this project is to create an application that allows dbas and developers to compare and synchronize the structure of two databases.
Plaform: .NET
Development language: C#

Project is discontinued as I haven't spare time now to dedicate to it.

Latest versions and other contributions can be found on sourceforge: http://sourceforge.net/projects/dabcos

If you're looking for a database compare tool, you can choose between two very nice tools:

RedGate SQLCompare

Apex SQL Diff