Finding ETL and data integration software can be a time-consuming (and expensive) process that necessitates a significant investment of both time and funds. Some of the most popular enterprise data management systems often provide more functionality than is necessary for non-business organizations and are therefore targeted at the most technically adept of end-users. Many free and open-source ETL tools exist, which is a relief. Some of these options are provided by companies hoping to sell you their enterprise product, while others are run and maintained by a community of developers hoping to make the process more accessible to everyone.

In this post, we’ll look at some of the open-source and free ETL tools that are currently on the market. We’ll start with a high-level overview and then go into the specifics of each solution. This directory is the most comprehensive and up to date on the Internet.

An Overview of the ETL Methodology

Using ETL, the Modern Data Analytics Stack extracts important and actionable customer insights from data sources like social media platforms, email/SMS services and customer support platforms, surveys, and a lot more. The three stages of the ETL process are as follows:

● Extraction: To unify structured and unstructured data from a variety of data sources, extraction is a crucial aspect of the ETL process. A few clicks are all it takes to extract meaningful information from a large amount of data. You don’t have to create any complicated code to accomplish any of this.

● Transformation: The process of transforming the extracted data into a format that can be used by a Data Warehouse or a BI (Business Intelligence) tool is called transformation. Some data transformation procedures include sorting, cleaning, removing redundant information, and verifying the data from the source.

● Loading: As BI tools are used to obtain insights and produce reports and dashboards, loading the transformed data into a destination, such as a Data Warehouse, is an important part of the process. Loading is critical since different BI tools are used to visualize the client data following this stage.

Top 10 Best ETL Tools That Are Free and Open Source

1. Apache Airflow

It’s possible to create, schedule, and monitor workflows with Apache Airflow. A directed acyclic graph authoring tool is provided by the software (DAGs). Using the airflow scheduler, jobs are executed on several workers while adhering to the defined dependencies. It’s easy to conduct complicated operations on DAGs thanks to the command-line tools provided by Airflow. In addition, the user interface gives users the ability to see how production pipelines are progressing, as well as to troubleshoot problems as they arise.

2. Apache NIfi

As a data processing and distribution system, it uses Apache NiFi, a graph-based approach to directing data flows for routing, transformation, and system mediation. The web-based user interface of NiFi allows users to switch between design, control, feedback, and monitoring. Dynamic Prioritization, Back Pressure, and Flow Modification at Runtime. Multi-tenant authentication, internal policy management, and internal authorization are all included in NiFi.

3. CloverETL

A pioneer in open source ETL, CloverETL is now CloverDX. Various data types can be transformed, mapped, and manipulated using the Java-based data integration framework. You can use CloverETL standalone or embedded to connect to RDBMS (JMS), SOAP (LDAP), S3, HTTP (FTP), ZIP, and TAR. A safe download of the product is still possible through Source Forge, despite the fact that the vendor no longer offers it. The CloverDX support agreement stipulates that they will continue to support CloverETL.

4. HPCC systems

Software architecture is implemented on commodity shared-nothing computing clusters in HPCC Systems, an open-source platform. In addition to batch data processing, it may also be used for high-performance data delivery applications using indexed data files. A special ECL scripting language for dealing with data is used by HPCC’s ETL engine, known as Thor.


To help with the creation and deployment of data integration projects that require ETL and scheduling, KETL is a production-ready ETL platform Complex data manipulations can be managed while utilizing an open-source data integration platform as a backend. Multi-threaded servers manage various job executors in the KETL engine. SQL, OS, XML, Sectionized, and Empty are all types of task executors, each with a specific function.

6. Talend open studio

A free and open-source ETL tool, Talend Open Studio for Data Integration is offered by Talend. A graphical design environment, support for ETL and ELT, versioning, and the export and execution of independent tasks in runtime environments are some of the features it offers customers. Connectors for RDBMS, SaaS, packaged apps, and technologies such as Dropbox, SMTP, FTP/SFTP, LDAP, and more are available in the software. In addition to data preparation and quality, Talend also provides open-source solutions in these areas.

7. Air Byte

A new Open-Source ETL tool called Air byte was released in July 2020. One of its unique selling points is the ability for community developers to monitor and update the tool, which sets it apart from other ETL solutions on the market.

Containers are used to run the connectors, which can be written in any language. By allowing customers to choose from a variety of components and feature sets, Air byte gives them additional options.

8. Apache Camel

Apache Camel is a free and open-source framework for integrating various protocols and technologies into a single application. You can use an API or a Java object-based implementation of the Enterprise Integration Patterns (EIP) to set up routing and mediation rules.

FTP, JMX, and HTTP are just a few of the 100+ components that make up Apache Camel. Information on which components are being used, the context path, as well as which options are being applied to which components are provided via URIs.

9. Pentaho kettle

As part of the Hitachi Vantara Community, Pentaho Kettle provides ETL capabilities based on metadata. Graphical drag and drop UI and standard architecture make it easy to use. Using this tool, users can design their own data manipulation tasks without writing any code. Pentaho Kettle works smoothly with Hitachi Vantara’s Open-Source BI tools for reporting and data mining.

10. Singer

The command-line interface is available in some Open-Source ETL tools. Using Singer’s “Tap” and “Target” modules, users can construct modular ETL Pipelines using a command-line interface. Singer gives customers the ability to link data sources directly to storage sites.

Pre-built taps can be used to construct ETL scripts, and users can write short, single-line ETL procedures that can be quickly adjusted by switching taps and targets.


List of the Top 10 Open-Source ETL Tools provided here. It also gave you a brief introduction to ETL. It went into greater detail about the tools’ functions. Finally, some of the limits of these technologies were brought to light. The regular development and lower prices of Open-Source ETL Tools make them essential in the field of Data Analytics today. Paid ETL Tools, on the other hand, offer more functionality and customer feedback. In the end, you can be confident that the quality of your data will

never be affected regardless of whether you choose a paid ETL tool or an open-source tool.

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