14 Best Open Source ETL Tools For QA Teams In 2024

CloverDX is ETL software that enables developers to connect to any data source and manage various data formats and transformations. The platform offers an extensive library of customizable components that allows you to read, write, aggregate, join, and validate data. CloverDX also provides an integrated development environment where you can easily code and debug solutions for your ETL processes.

CloverDX’s automation tools help developers reduce manual data refinement tasks. Users can build automated processes to profile and validate data throughout their pipelines. These automated processes enable developers to scale ETL testing and error management to ensure business operations are aligned with high-quality data.

Pricing for CloverDX subscriptions is available upon request. While CloverDX is a commercial ETL tool, some parts of the platform are built with open source components.

Apache NiFi is an ETL tool that automates data flow between software systems. NiFi is scalable in that data transformation and routing can run on a single server or in clusters across multiple servers. Its drag-and-drop UI enables ETL developers to manage dataflows in real-time easily. NiFi is also highly configurable, allowing developers to create custom processors and reporting tasks.

NiFi ensures the security of your data flow by supporting secure protocols, including HTTPS and SSH. The system also embeds security at the user level by enabling two-way SSL authentication and user role management. Additionally, when users enter sensitive information into a data flow, such as their password, NiFi automatically encrypts it server-side.

Developers can extend NiFi by adding controller services, prioritizers, and customer user interfaces.

The software is free to download.

Hevo loads data from any source to your warehouse in real-time with zero coding required. The platform is highly intuitive, with a three-step setup process. As your business grows, so does Hevo. It was designed to handle millions of records per minute and automatically scales.

Businesses can transfer data from their data warehouse to any marketing, sales, and business applications with Hevo’s reverse ETL solution, Hevo Activate. The platform works on top of your existing data warehouse, so your data remains in one location. Activate also fixes data incompatibility issues between your warehouse and a target application. The tool automatically converts data types from your warehouse to match your target application.

Hevo integrates with over 100 databases, SaaS applications, and CRMs, including BigQuery, MySQL, and Salesforce.

Hevo offers free and paid subscriptions based on usage.

KETL is an ETL solution that enables the development and deployment of data integration processes. With KETL’s scheduling manager, users can execute ETL jobs based on time or data events. KETL supports multiple data sources, including proprietary database APIs and relational and flat file sources.

The platform’s ETL engine is scalable and platform-independent, with support for multiple CPUs and 64-bit servers. This allows users to perform complex data manipulations in minimal time. Users can analyze their data processes with KETL’s performance monitoring tools, which collect statistics on historical and active ETL jobs.

KETL supports integrations with security and data management tools.

KETL is free to download.

Talend Open Studio is a suite of open source tools that enables ETL developers to build basic data pipelines in less time. It features an Eclipse-based development environment and more than 900 pre-built connectors, including Oracle, Teradata, Marketo, and Microsoft SQL Server. The platform includes five components: Talend Open Studio for Data Integration, Big Data, Data Quality, Enterprise Service Bus (ESB), and Master Data Management (MDM).

Talend Open Studio is a great companion for many business intelligence (BI) tools. It provides several methods for converting multiple datasets into formats compatible with popular BI platforms, including Jasper, OLAP, and SPSS. Users can also glean insights directly from Talend Open Studio, which can generate basic visualizations, including bar charts.

Talend Open Studio supports integrations with several databases, including Microsoft SQL Server, Postgres, MySQL, Teradata, and Greenplum.

Talend Open Studio is free to download for all users.

Logstash is an open-source server-side data processing tool for ingesting, transforming, and shipping raw data. The platform collects logs, transactions, events, and many other data types from nearly any source, including CRMs or e-commerce systems. Regardless of your data’s format or complexity, Logstash enables you to ease many data processes, like filtering personally identifiable information and structuring data.

Logstash operates on a pluggable framework with many input and output plugins available. Input plugins allow Logstash to ingest events from multiple sources, like files or GitHub. Logstash’s output plugins can route data to many targets, including data warehouses and cloud platforms. If Logstash doesn’t have a plugin that suits your needs, you can utilize the tool’s API to create your own.

ETL developers have complete visibility into their pipeline configurations with Logstash’s pipeline viewer UI. The interface lets you observe active Logstash nodes and deployments to monitor performance, availability, and bottlenecks.

Developers can download Logstash for free.

pygrametl is an open-source Python framework for developing ETL processes. It was designed to be an alternative to graphical BI programs while having the same ease of use. It supports CPython and Jython, enabling ETL developers to utilize existing Java code and JDBC drivers.

Developers can extract data from numerous sources available in pygrametl, such as SQL, CSV, and Pandas. Users can also define their own data sources. The platform provides filters and aggregators for transforming data. Default aggregators include AVG, Count, CountDistinct, Max, Min, and Sum.

pygrametl can load transformed data into any data warehouse that supports dimensional modeling. The system provides structures for defining fact tables and dimensions, including slowly changing and snowflaked dimensions.

Developers can download pygrametl for free.

Singer offers a simplified way to write and collaborate on ETL scripts. The software consists of two main components, taps and targets. Taps extract data from sources, while targets send data to destinations. Users can mix and match taps and targets and send data between databases, web APIs, files, and many other systems.

Taps and targets communicate with JSON, enabling users to implement them in any programming language. With support for JSON Schema, Singer provides rich data types and rigid structure when needed.

Users can develop custom taps and targets or choose from over 50 applications readily available on Singer’s website, including Eloqua, GitHub, Oracle, and PostgreSQL. Singer applications are composed with pipes, meaning daemons and complicated plugins aren’t necessary for implementation.

Singer.io is open source and free to use.

Apache Kafka is a distributed event streaming platform that combines messaging, storage, and stream processing. Users can publish and subscribe to streams of records, store streams of records in the order they’re generated, and process streams in real-time.

Organizations typically utilize Kafka to record and store events like payment transactions, shipping orders, and website activity. The tool is highly scalable and can handle complex, high throughput data feeds with low latency.

Fault tolerance is another key feature of Apache Kafka. The system replicates and distributes partitions across multiple servers, minimizing the risk of data loss if a server goes down. Users can configure the replication factor to specify how many copies of a partition are needed.

Kafka offers native integrations with over 100 event sources and event sinks, including Postgres, JMS, and AWS S3.

Kafka is available to download for free.

Scriptella is an open source, simple-t0-use ETL and script execution tool written in Java. It heavily embraces XML but makes it easy to use while also facilitating the automation of ETL processes. In addition to executing scripts written in JavaScript, SQL, Velocity, and JEXL, Scriptella is also used for the following: cross-database ETL operations, database migration, automated database schema upgrade, import/export capabilities, along with interoperability with data sources like LDAP, JDBC, and XML.Scriptella allows for integration with JVM languages like Groovy and integrates easily with Ant while working with any JDBC driver. Scriptella permits transactional execution.Scriptella is open source and free.