My most recent project involves WebFocus from Information Builders. Although WebFocus is a very powerful platform, the client was still using a fairly old version so we opted to move the application to SQL Server. This in itself was quite a task as WebFocus doesn't offer an ODBC connector to pull data out of it's proprietary database.
WebFocus allows you to export data directly to SQL Server, Excel, CSV, and many other file formats or database systems, but migrating a real world application out of WebFocus wasn't nearly as simple as they lead you to believe.
In comes Data Integrator, a product from Pervasive. Data Integrator is a very powerful tool that allows you to move data to-and-from roughly 150 different file formats and database platforms. Data Integrator allows you to build an easy and reproducible process to migrate data out of your legacy applications.
This white paper about Intuit shows the true power available within Pervasive's suite of products, and I highly recommend taking a look if you find yourself needing to migrate a legacy application. Although the white paper shows an extraordinary use of their products, they can be used to simplify even the most basic of integration projects.
Feel free to ping me at email@example.com if you find yourself heading down this road. I would be more than happy to help out and/or share some of my experiences with this process.