Free and Open Source ETL Tools

Here are some popular open source and free ETL tools that can be used in your Data Warehousing Projects:

1. Apache NiFi: Apache NiFi is a free and open source data integration platform that allows you to automate the flow of data between systems. It provides a web-based user interface to design, manage and monitor data flows, and supports a wide range of data sources and destinations.
2. Talend Open Studio: Talend Open Studio is a free and open source data integration tool that allows you to design and execute ETL jobs. It provides a drag-and-drop interface to create data integration workflows and supports a wide range of data sources and destinations.
3. Pentaho Data Integration: Pentaho Data Integration (PDI) is a free and open source ETL tool that allows you to extract, transform, and load data from various sources. It provides a graphical interface to design ETL jobs and supports a wide range of data sources and destinations.
4. Kettle: Kettle is an open source ETL tool that is part of the Pentaho Data Integration suite. It provides a graphical interface to design ETL jobs and supports a wide range of data sources and destinations. Kettle is a Java-based tool and can be integrated with other Java-based applications.
5. Scriptella: Scriptella is a free and open source ETL tool that allows you to write ETL scripts in XML, SQL, or other languages. It provides a command-line interface to execute ETL scripts and supports a wide range of data sources and destinations.

These open source and free ETL tools provide a cost-effective solution for small to medium-sized businesses that need to extract, transform, and load data from various sources without having to invest in expensive ETL solutions.