List of the Top 16 Free Event Stream Processing Software in 2025

A cloud-centric observability platform that enables organizations to oversee and analyze their workloads and performance through a unified interface. Keep an eye on all your cloud services while maintaining cost efficiency, detailed insights, and scalability. Groundcover offers a cloud-native application performance management (APM) solution designed to simplify observability, allowing you to concentrate on developing exceptional products. With Groundcover's unique sensor technology, you gain exceptional detail for all your applications, removing the necessity for expensive code alterations and lengthy development processes, which assures consistent monitoring. This approach not only enhances operational efficiency but also empowers teams to innovate without the burden of complicated observability challenges.

A Unified Platform for Instant Communication: An innovative solution designed for creating and managing real-time interactions across web, mobile, AI/ML, IoT, and edge computing applications. Streamlined and Accelerated Deployments: With SDK compatibility for over 50 environments including mobile, web, server, and IoT (supported by both PubNub and the community), alongside more than 65 ready-made integrations with various external and third-party APIs, the platform ensures you have access to essential features, irrespective of your programming language or technology stack. Unmatched Scalability: Recognized as the most scalable platform in the industry, it can effortlessly accommodate millions of simultaneous users, ensuring rapid expansion with minimal latency and high uptime, all without incurring financial penalties, making it a reliable choice for growing businesses. Furthermore, this platform is designed to evolve with your needs, supporting future advancements in technology seamlessly.

Ably stands out as the leading platform for realtime experiences. With more WebSocket connections than any competing pub/sub service, we facilitate connections for over a billion devices each month. Companies rely on us for their essential applications, including chat, notifications, and broadcasts, ensuring that these services run reliably, securely, and at an impressive scale. Our commitment to excellence makes us the preferred choice for businesses seeking to enhance their realtime capabilities.

RudderStack serves as an intelligent solution for managing customer information flows. With it, you can effortlessly construct pipelines that integrate your complete customer data ecosystem. Furthermore, you can enhance these pipelines by sourcing data from your data warehouse, facilitating enriched interactions within customer tools for identity stitching and various other sophisticated applications. Begin developing more intelligent customer data pipelines now to maximize your insights.

Apache Kafka® can be incredibly straightforward when equipped with the appropriate tools, and that's precisely why kPow was developed—to enhance the Kafka development process while helping organizations save both time and resources. With kPow, pinpointing the source of production issues becomes a task of mere clicks rather than lengthy hours of investigation. Leveraging features like Data Inspect and kREPL, users can efficiently sift through tens of thousands of messages every second. For those new to Kafka, kPow's distinctive UI facilitates a quick grasp of fundamental Kafka principles, enabling effective upskilling of team members and broadening their understanding of Kafka as a whole. Additionally, kPow is packed with numerous Kafka management functions and monitoring capabilities all bundled into a single Docker Container, providing the flexibility to oversee multiple clusters and schema registries seamlessly, all while allowing for easy installation with just one instance. This comprehensive approach not only streamlines operations but also empowers teams to harness the full potential of Kafka technology.

Instaclustr, a company focused on Open Source-as-a-Service, ensures dependable performance at scale. Our services encompass database management, search functionalities, messaging solutions, and analytics, all within a reliable, automated managed environment that has been tested and proven. By partnering with us, organizations can direct their internal development and operational efforts towards building innovative applications that enhance customer experiences. As a versatile cloud provider, Instaclustr collaborates with major platforms including AWS, Heroku, Azure, IBM Cloud, and Google Cloud Platform. In addition to our SOC 2 certification, we pride ourselves on offering round-the-clock customer support to assist our clients whenever needed. This comprehensive approach to service guarantees that our clients can operate efficiently and effectively in their respective markets.

IBM® StreamSets empowers users to design and manage intelligent streaming data pipelines through a user-friendly graphical interface, making it easier to integrate data seamlessly in both hybrid and multicloud settings. Renowned global organizations leverage IBM StreamSets to manage millions of data pipelines, facilitating modern analytics and the development of smart applications. This platform significantly reduces data staleness while providing real-time information at scale, efficiently processing millions of records across thousands of pipelines within seconds. The drag-and-drop processors are designed to automatically identify and adapt to data drift, ensuring that your data pipelines remain resilient to unexpected changes. Users can create streaming pipelines to ingest structured, semi-structured, or unstructured data, efficiently delivering it to various destinations while maintaining high performance and reliability. Additionally, the system's flexibility allows for rapid adjustments to evolving data needs, making it an invaluable tool for data management in today's dynamic environments.

Solace specializes in Event-Driven Architecture (EDA) and boasts two decades of expertise in delivering highly dependable, robust, and scalable data transfer solutions that utilize the publish & subscribe (pub/sub) model. Their technology facilitates the instantaneous data exchange that underpins many daily conveniences, such as prompt loyalty rewards from credit cards, weather updates on mobile devices, real-time tracking of aircraft on the ground and in flight, as well as timely inventory notifications for popular retail stores and grocery chains. Additionally, the technology developed by Solace is instrumental for numerous leading stock exchanges and betting platforms worldwide. Beyond their reliable technology, exceptional customer service is a significant factor that attracts clients to Solace and fosters long-lasting relationships. The combination of innovative solutions and dedicated support ensures that customers not only choose Solace but also continue to rely on their services over time.

MongoDB Atlas is recognized as a premier cloud database solution, delivering unmatched data distribution and fluidity across leading platforms such as AWS, Azure, and Google Cloud. Its integrated automation capabilities improve resource management and optimize workloads, establishing it as the preferred option for contemporary application deployment. Being a fully managed service, it guarantees top-tier automation while following best practices that promote high availability, scalability, and adherence to strict data security and privacy standards. Additionally, MongoDB Atlas equips users with strong security measures customized to their data needs, facilitating the incorporation of enterprise-level features that complement existing security protocols and compliance requirements. With its preconfigured systems for authentication, authorization, and encryption, users can be confident that their data is secure and safeguarded at all times. Moreover, MongoDB Atlas not only streamlines the processes of deployment and scaling in the cloud but also reinforces your data with extensive security features that are designed to evolve with changing demands. By choosing MongoDB Atlas, businesses can leverage a robust, flexible database solution that meets both operational efficiency and security needs.

Start by accessing a simple link or leverage our client libraries that come with batching features. Keep track of signups, response times, monthly recurring revenue, and other important metrics, then present your insights on an attractive dashboard. Organize your key performance indicators into customized dashboards that provide a visually appealing view suitable for TV mode. You also have the option to send additional data to analyze differences across various categories. Easily integrate with NodeJS and Go through our effective and intuitive libraries. All your data is securely stored and accessible at a one-minute resolution, which we maintain throughout your subscription period. Motivate your team to work together and enjoy the visually stunning dashboards as a group. We have carefully crafted the system to ensure fast data loading. Furthermore, we’re committed to making data visualization not only informative but also engaging and beautiful, which is why we prioritize aesthetics in our designs. The aim is to create an enjoyable experience while you gain valuable insights from your data.

Nussknacker provides domain specialists with a low-code visual platform that enables them to design and implement real-time decision-making algorithms without the need for traditional coding. This tool facilitates immediate actions on data, allowing for applications such as real-time marketing strategies, fraud detection, and comprehensive insights into customer behavior in the Internet of Things. A key feature of Nussknacker is its visual design interface for crafting decision algorithms, which empowers non-technical personnel, including analysts and business leaders, to articulate decision-making logic in a straightforward and understandable way. Once created, these scenarios can be easily deployed with a single click and modified as necessary, ensuring flexibility in execution. Additionally, Nussknacker accommodates both streaming and request-response processing modes, utilizing Kafka as its core interface for streaming operations, while also supporting both stateful and stateless processing capabilities to meet various data handling needs. This versatility makes Nussknacker a valuable tool for organizations aiming to enhance their decision-making processes through real-time data interactions.

The Flowcore platform serves as a holistic solution for both event streaming and event sourcing, all contained within a single, intuitive service. It ensures a seamless flow of data and dependable, replayable storage, crafted specifically for developers at data-driven startups and enterprises aiming for ongoing innovation and progress. Your data operations are securely safeguarded, guaranteeing that no significant information is lost or compromised. With capabilities for immediate transformation and reclassification of your data, it can be effortlessly directed to any required destination. Bid farewell to limiting data frameworks; Flowcore's adaptable architecture evolves in tandem with your business, managing growing data volumes with ease. By streamlining backend data functions, your engineering teams can focus on what they do best—creating innovative products. Additionally, the platform boosts the integration of AI technologies, enriching your offerings with smart, data-driven solutions. Although Flowcore is tailored for developers, its benefits extend well beyond the technical realm, positively impacting the entire organization in achieving its strategic objectives. Ultimately, Flowcore empowers businesses to significantly enhance their data strategy, paving the way for future success and efficiency. With this platform, you can truly reach new levels of excellence in managing and utilizing your data.

We offer a globally distributed, real-time database paired with stream processing and computational capabilities tailored for event-driven applications, leveraging an extensive network of up to 175 edge data centers worldwide. Our platform is highly valued by developers and API creators as it effectively resolves the intricate issues associated with managing shared mutable state across numerous locations, ensuring both strong consistency and low latency. Macrometa enables you to effortlessly enhance your current infrastructure by relocating parts of your application or the entire system closer to your users, thereby significantly improving performance, enriching user experiences, and ensuring compliance with international data governance standards. As a serverless, streaming NoSQL database, Macrometa includes built-in pub/sub features, stream data processing, and a robust compute engine. Users can establish a stateful data infrastructure, develop stateful functions and containers optimized for long-term workloads, and manage real-time data streams with ease. While you concentrate on your coding projects, we take care of all operational tasks and orchestration, allowing you to innovate without limitations. Consequently, our platform not only streamlines development but also enhances resource utilization across global networks, fostering an environment where creativity thrives. This combination of capabilities positions Macrometa as a pivotal solution for modern application demands.

Captivating applications not only engage users but also inspire developers to push the boundaries of innovation. In order to address the increasing demands of today's digital ecosystem, exploring the DataStax Astra Streaming service platform may prove beneficial. This platform, designed for cloud-native messaging and event streaming, is grounded in the powerful technology of Apache Pulsar. Developers can utilize Astra Streaming to build dynamic streaming applications that take advantage of a multi-cloud, elastically scalable framework. With the sophisticated features offered by Apache Pulsar, this platform provides an all-encompassing solution that integrates streaming, queuing, pub/sub mechanisms, and stream processing capabilities. Astra Streaming is particularly advantageous for users of Astra DB, as it facilitates the effortless creation of real-time data pipelines that connect directly to their Astra DB instances. Furthermore, the platform's adaptable nature allows for deployment across leading public cloud services such as AWS, GCP, and Azure, thus mitigating the risk of vendor lock-in. Ultimately, Astra Streaming empowers developers to fully leverage their data within real-time environments, fostering greater innovation and efficiency in application development. By employing this versatile platform, teams can unlock new opportunities for growth and creativity in their projects.

A versatile Python framework crafted for the development of real-time intelligent applications, the construction of data pipelines, and the seamless integration of AI and machine learning models. This framework enhances scalability, enabling developers to efficiently manage increasing workloads and complex processes.

Upsolver simplifies the creation of a governed data lake while facilitating the management, integration, and preparation of streaming data for analytical purposes. Users can effortlessly build pipelines using SQL with auto-generated schemas on read. The platform includes a visual integrated development environment (IDE) that streamlines the pipeline construction process. It also allows for Upserts in data lake tables, enabling the combination of streaming and large-scale batch data. With automated schema evolution and the ability to reprocess previous states, users experience enhanced flexibility. Furthermore, the orchestration of pipelines is automated, eliminating the need for complex Directed Acyclic Graphs (DAGs). The solution offers fully-managed execution at scale, ensuring a strong consistency guarantee over object storage. There is minimal maintenance overhead, allowing for analytics-ready information to be readily available. Essential hygiene for data lake tables is maintained, with features such as columnar formats, partitioning, compaction, and vacuuming included. The platform supports a low cost with the capability to handle 100,000 events per second, translating to billions of events daily. Additionally, it continuously performs lock-free compaction to solve the "small file" issue. Parquet-based tables enhance the performance of quick queries, making the entire data processing experience efficient and effective. This robust functionality positions Upsolver as a leading choice for organizations looking to optimize their data management strategies.