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Free Open-Source ETL tools
Open source ETL does not provide management capabilities that could be considered as a cross-enterprise standard for data integration. They are missing advanced connectivity, techniques of real-time data integration, such as enterprise information integration (EII) or change data capture (CDC), collaboration of enterprise-level, integrated data quality management and profiling. Yet many enterprises are not looking for large and expensive data integration suite. If there is an efficient and reliable alternative available to custom code of data integration requirements, an option to use free ETL technologies should be taken into consideration.
ETL tools are used to:
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Extract data from homogeneous or heterogeneous data sources
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Transform the data for storing it in proper format or structure for querying and analysis purpose
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Load it into the final target (database, more specifically, operational data store, data mart, or data warehouse)
Usually in ETL tools, all the three phases execute in parallel since the data extraction takes time, so while the data is being pulled another transformation process executes, processing the already received data and prepares the data for loading and as soon as there is some data ready to be loaded into the target, the data loading kicks off without waiting for the completion of the previous phases.
Here is the list of 5 open source ETL tools.
Talend Open Source Data Integrator
Talend provides multiple solutions for data integration, both open source and commercial editions. Talend offers an Eclipse-based interface, drag-and-drop design flow, and broad connectivity with more than 400 pre-configured application connectors to bridge between databases, mainframes, file systems, web services, packaged enterprise applications, data warehouses, OLAP applications, Software-as-a-Service, Cloud-based applications, and more.
Scriptella is an open source ETL (Extract-Transform-Load) and script execution tool written in Java. Its primary focus is simplicity. You don't have to study yet another complex XML-based language - use SQL (or other scripting language suitable for the data source) to perform required transformations. Scriptella is licensed under the Apache License, Version 2.0
KETL is a premier, open source ETL tool. The data integration platform is built with portable, java-based architecture and open, XML-based configuration and job language. KETL features successfully compete with major commercial products available today.
Jasper ETL is easy to deploy and out-performs many proprietary ETL software systems. It is used to extract data from your transactional system to create a consolidated data warehouse or data mart for reporting and analysis.
The CloverETL Open Source Engine can be embedded in any application, commercial ones as well. The Open Source Engine does not contain a number of components that the full engine contains. We do not provide support for the Open Source Engine
Apatar is an open source Extract, Transform, and Load (ETL) project. Modular architecture delivers 1. Visual job designer/mapping 2. Connectivity to all major data sources 3. Flexible Deployment Options (GUI, or server engine with JVM, or embedded).