List of the Top 9 Free Event Brokers in 2025

RabbitMQ serves as a nimble messaging solution that can be easily implemented in both on-premises setups and cloud-based environments. Its support for multiple messaging protocols renders it a flexible choice for a variety of applications. Additionally, RabbitMQ can be set up in distributed and federated configurations to meet the needs for high scalability and robust availability. With a large community of users, it is recognized as one of the top open-source message brokers currently available. Companies ranging from T-Mobile to Runtastic utilize RabbitMQ, demonstrating its suitability for both burgeoning startups and established enterprises alike. Moreover, it is designed to work seamlessly across a multitude of operating systems and cloud platforms, providing a rich array of development tools tailored for popular programming languages. Users can take advantage of deployment options including Kubernetes, BOSH, Chef, Docker, and Puppet, which enables smooth integration into their current environments. Developers also have the ability to craft cross-language messaging solutions using a selection of programming languages such as Java, .NET, PHP, Python, JavaScript, Ruby, and Go, thereby broadening its applicability across diverse projects. Ultimately, RabbitMQ’s versatility and compatibility make it an essential tool for modern software development.

A managed service enables seamless two-way communication between IoT devices and Azure, providing secure and reliable connections for your Internet of Things (IoT) applications. Serving as a cloud-based backend, Azure IoT Hub can effortlessly connect virtually any device. To enhance your solution, you can integrate from the cloud to the edge, employing per-device authentication, built-in management features, and scalable provisioning capabilities. By utilizing telemetry data from devices to the cloud, you can effectively monitor device statuses and create message routes to various Azure services without requiring coding expertise. Furthermore, cloud-to-device messaging ensures that commands and notifications are transmitted reliably to your connected devices, with delivery tracking made possible through acknowledgment receipts. In cases where connectivity is disrupted, the system automatically retransmits messages, maintaining communication flow. Our goal with Azure IoT Central is to elevate your projects beyond basic proof of concept; we support the creation of innovative, industry-leading solutions through a fully managed IoT application platform that accelerates progress. This holistic strategy empowers organizations to unlock the full potential of IoT technology, driving transformative changes in their operational processes. With this level of support, businesses can confidently explore new avenues for efficiency and growth in their respective industries.

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.

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.

HiveMQ stands out as the most trusted MQTT platform for enterprises, designed specifically to facilitate connections through MQTT, ensure dependable communication, and manage IoT data effectively. Its versatility allows for deployment in various environments, whether on-premise or in the cloud, granting developers the adaptability they require as their IoT projects expand. Known for its reliability even under challenging conditions, HiveMQ scales effortlessly and incorporates enterprise-level security features that cater to organizations at any phase of their digital transformation journey. Furthermore, this flexible platform enables smooth integration with top data streaming services, databases, and analytics tools, while also providing a customizable SDK to seamlessly integrate into any technological ecosystem. As IoT demands continue to evolve, HiveMQ remains a pivotal resource for businesses aiming to leverage cutting-edge technology.

StreamNative revolutionizes the streaming infrastructure landscape by merging Kafka, MQ, and multiple other protocols into a unified platform, providing exceptional flexibility and efficiency that aligns with current data processing needs. This comprehensive solution addresses the diverse requirements of streaming and messaging found within microservices architectures. By offering an integrated and intelligent strategy for both messaging and streaming, StreamNative empowers organizations with the capabilities to tackle the complexities and scalability challenges posed by today’s intricate data ecosystems. Additionally, the unique architecture of Apache Pulsar distinguishes between the message serving and storage components, resulting in a resilient cloud-native data-streaming platform. This design is both scalable and elastic, permitting rapid adaptations to changes in event traffic and shifting business demands, while also scaling to manage millions of topics, thereby ensuring that computation and storage functions remain decoupled for enhanced performance. Ultimately, this pioneering structure positions StreamNative at the forefront of meeting the diverse needs of modern data streaming, while also paving the way for future advancements in the field. Such adaptability and innovation are crucial for organizations aiming to thrive in an era where data management is more critical than ever.

Lightstreamer serves as a highly specialized event broker tailored for the internet, ensuring a seamless and rapid exchange of data across various online platforms. Unlike traditional brokers, it skillfully addresses the complexities of proxies, firewalls, network disruptions, congestion, and the unpredictable nature of web connectivity. Its cutting-edge streaming technology guarantees the continuous and prompt delivery of real-time data, consistently identifying efficient and reliable routes for your information. Lightstreamer's innovative capabilities are not only well-established but also continuously evolve, affirming its status as a leader in technological advancement. With a rich history and vast practical expertise, it promises safe and effective data transmission. Users can rely on Lightstreamer for unparalleled reliability in any scenario, solidifying its role as an essential asset for real-time communication requirements. In the dynamic realm of digital transformation, Lightstreamer emerges as a dependable ally for facilitating seamless data delivery while adapting to emerging trends. This adaptability positions Lightstreamer as a forward-thinking solution in a fast-paced environment.

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.