ETL tools

I have joined an agile database mail list, and I have started learning (10 points).

ETL stands for Extract, Transform and Load, that are processes to be carried on when:

• adding data to a warehouse
• exchanging data between databases
• integration of legacy systems

Some open source tools are

• Kettle
• Scriptelle Open Source ETL Toll
• Talend Open Studio

These tools can be quite interesting to me work for its capacity in SQL scripting and connect databases. I mean, although this tool are planned to connect different databases, it could be use to connect a database in time1, with this database in time2.