Shameless plug. I've developed a similar tool to this without the gui frontend, distributed as a ruby gem - http://dbgeni.com It was inspired by Ruby on Rails and was quite a nice project to develop. It supports oracle, SQLite, sybase and MySQL out of the box. It also handles deploying stored procedures.

In a previous job, I used a technique like this to deploy pretty big Oracle application, being worked on by 160 developers, so using migrations to manage your database does work... with some care!