List of the Top 14 Free Real-Time Data Streaming Tools in 2025

StarTree Cloud functions as a fully-managed platform for real-time analytics, optimized for online analytical processing (OLAP) with exceptional speed and scalability tailored for user-facing applications. Leveraging the capabilities of Apache Pinot, it offers enterprise-level reliability along with advanced features such as tiered storage, scalable upserts, and a variety of additional indexes and connectors. The platform seamlessly integrates with transactional databases and event streaming technologies, enabling the ingestion of millions of events per second while indexing them for rapid query performance. Available on popular public clouds or for private SaaS deployment, StarTree Cloud caters to diverse organizational needs. Included within StarTree Cloud is the StarTree Data Manager, which facilitates the ingestion of data from both real-time sources—such as Amazon Kinesis, Apache Kafka, Apache Pulsar, or Redpanda—and batch data sources like Snowflake, Delta Lake, Google BigQuery, or object storage solutions like Amazon S3, Apache Flink, Apache Hadoop, and Apache Spark. Moreover, the system is enhanced by StarTree ThirdEye, an anomaly detection feature that monitors vital business metrics, sends alerts, and supports real-time root-cause analysis, ensuring that organizations can respond swiftly to any emerging issues. This comprehensive suite of tools not only streamlines data management but also empowers organizations to maintain optimal performance and make informed decisions based on their analytics.

Create and distribute real-time business dashboards effortlessly with Geckoboard, which seamlessly connects to over 80 different tools and services, allowing you to compile your data and design a professional dashboard in just a few minutes. Utilize an intuitive drag-and-drop interface directly in your web browser to transform dull reports into vibrant displays of vital numbers, metrics, and KPIs. Once your dashboard is set up, you can easily share it via a link, invite team members to collaborate, and schedule automatic updates through email or Slack. For enhanced visibility, Geckoboard offers a 'Send to TV' feature, enabling you to connect your account to a large screen or television, where you can select which dashboards to showcase. This feature even allows for multiple dashboards to be cycled through on a single screen, ensuring that vital information is always on display. With straightforward instructions, you can complete this setup in just a few hours using readily available and cost-effective hardware. By doing so, you not only keep your team informed but also foster a culture of transparency and data-driven decision-making.

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.

Bid farewell to the challenges associated with low-level programming and the integration of complex systems. With SQL at your disposal, you can swiftly create and deploy data pipelines in just a few minutes. This innovative data engineering service equips both developers and data engineers with the tools needed to effortlessly build and implement real-time data pipelines designed specifically for data-driven applications. The platform boasts a variety of pre-built connectors for different messaging frameworks, storage options, and database management systems, thereby easing the connection and exploration of available data. Each connection you establish produces a stream that enhances the flow of data to and from the associated system. By using Decodable, you can construct your pipelines with SQL, where these streams are essential for the transmission of data between your connections. Furthermore, streams can be employed to interlink pipelines, allowing you to tackle even the most complex processing challenges with ease. You also have the ability to monitor your pipelines, ensuring that data flows continuously and smoothly while creating curated streams that can be shared with other teams for collaborative purposes. Implementing retention policies on your streams safeguards against data loss during interruptions from external systems, while real-time health and performance metrics keep you updated on the operational status, ensuring that all processes run efficiently. In conclusion, Decodable revolutionizes the entire data pipeline landscape, enhancing efficiency and facilitating faster outcomes in both data management and analysis, and ultimately transforming how organizations handle their data.

Leverage Pipes to effortlessly query and manipulate your data, presenting a fresh technique for connecting SQL queries inspired by the functionality of Python Notebooks. This innovative strategy is designed to reduce complexity while ensuring top-notch performance. By segmenting your query into multiple nodes, you significantly improve both the development and upkeep of your data processes. With a single click, you can deploy your API endpoints, making them production-ready in no time. Transformations occur in real-time, guaranteeing that you always have access to the latest data available. You can easily and securely share data access with just one click, yielding prompt and reliable results. Tinybird not only provides monitoring tools but is also built to scale with ease, alleviating concerns about sudden increases in traffic. Visualize the capability to convert any Data Stream or CSV file into a fully secured real-time analytics API endpoint within minutes. We support high-frequency decision-making across various industries, including retail, manufacturing, telecommunications, government, advertising, entertainment, healthcare, and financial services, thereby making data-driven insights available to diverse organizations. Our mission is to enable businesses to make quick and informed decisions, ensuring they remain competitive in a rapidly changing environment while fostering innovation and growth.

HarperDB stands out as a cutting-edge platform that seamlessly combines database management, caching, application development, and streaming functionalities into a unified system. This integration enables businesses to establish global-scale back-end services with considerably less effort, improved performance, and significant cost reductions compared to conventional approaches. Users are empowered to create custom applications while also utilizing pre-built add-ons, ensuring a highly efficient environment with ultra-low latency to meet their data requirements. Its remarkably fast distributed database delivers throughput rates that far exceed those of typical NoSQL solutions, all while offering limitless horizontal scalability. Furthermore, HarperDB facilitates real-time pub/sub communication and data processing through various protocols, including MQTT, WebSocket, and HTTP. This capability allows organizations to harness robust data-in-motion functionalities without needing to incorporate additional services like Kafka into their infrastructure. By emphasizing features that foster business expansion, companies can sidestep the intricacies associated with managing complex systems. In a world where you cannot change the speed of light, minimizing the distance between users and their data is crucial for boosting overall operational efficiency and responsiveness. Ultimately, HarperDB enables businesses to concentrate on innovation and development, freeing them from the burden of technical obstacles and allowing them to pursue their strategic goals more effectively. This unique approach to database management marks a significant shift in how organizations view their data architecture.

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.

Aerospike stands out as a leading provider of cutting-edge, real-time NoSQL data solutions that effectively handle vast amounts of data. By addressing complex data challenges, Aerospike enables enterprises to remain competitive while significantly reducing costs and simplifying the processes that legacy NoSQL databases typically present. Their innovative Hybrid Memory Architecture™ is a patented advancement that maximizes the capabilities of contemporary hardware, allowing businesses to derive exceptional value from extensive data across various environments, including edge, core, and cloud settings. With Aerospike, clients can swiftly tackle issues like fraud, enhance shopping experiences with larger cart sizes, establish global digital payment systems, and deliver personalized experiences to millions in real-time. Notable clients include Airtel, Banca d'Italia, Snap, Verizon Media, Wayfair, PayPal, and Nielsen. The company is headquartered in Mountain View, California, with additional offices in London, Bengaluru, and Tel Aviv, ensuring a global presence to support its diverse clientele.

In the realm of IoT stream processing and analytics, SQLstream has been recognized as the leading solution by ABI Research. Our technology, utilized by major corporations such as Verizon, Walmart, Cisco, and Amazon, facilitates applications across various environments, including on-premises, cloud, and edge computing. SQLstream's capabilities allow for the generation of urgent alerts, dynamic dashboards, and immediate responses with latency measured in sub-milliseconds. This enables smart cities to efficiently redirect emergency services and optimize traffic signal operations based on current conditions. Additionally, security frameworks can swiftly identify and neutralize cyber threats, ensuring safety and integrity. Furthermore, AI and machine learning models, developed using streaming sensor inputs, are capable of forecasting potential equipment malfunctions. Due to SQLstream's remarkable speed — accommodating up to 13 million rows per second for each CPU core — organizations have significantly minimized their operational costs and physical infrastructure. Our advanced in-memory processing fosters capabilities at the edge that would typically be unfeasible. Users can acquire, prepare, analyze, and take action on data across various formats and sources seamlessly. With StreamLab, our user-friendly, low-code development environment, creating data pipelines becomes a task that can be accomplished in minutes rather than months. Instant script editing and real-time result visualization without the need for compilation streamline the development process further. Deployment is made easier with robust support for Kubernetes, simplifying integration into existing workflows. The installation process is user-friendly and compatible with a variety of platforms, including Docker, AWS, Azure, Linux, VMWare, and others, ensuring flexibility for diverse operational needs.

Memgraph presents a robust and agile graph platform that includes the Memgraph Graph Database, the MAGE Library, and the Memgraph Lab Visualization tool. This innovative graph database is designed to enable rapid and efficient analysis of data, relationships, and dependencies. It features an extensive array of pre-existing deep path traversal algorithms, alongside a collection of traditional, dynamic, and machine learning algorithms specifically created for in-depth graph analysis, making Memgraph a prime option for crucial decision-making processes like risk evaluation (including fraud detection, cybersecurity threat assessment, and criminal risk analysis), comprehensive data and network exploration (such as Identity and Access Management, Master Data Management, and Bill of Materials), and the optimization of logistics and networks. Additionally, Memgraph boasts a thriving open-source community that unites over 150,000 developers from more than 100 countries, fostering collaboration and innovation in developing the next generation of in-memory data-driven applications, particularly in the realms of GenAI, LLMs, and real-time analytics with streaming data. Such a vibrant community not only enhances the platform's capabilities but also ensures that it remains at the forefront of technology advancements in the graph database ecosystem.

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.

Apache Doris is a sophisticated data warehouse specifically designed for real-time analytics, allowing for remarkably quick access to large-scale real-time datasets. This system supports both push-based micro-batch and pull-based streaming data ingestion, processing information within seconds, while its storage engine facilitates real-time updates, appends, and pre-aggregations. Doris excels in managing high-concurrency and high-throughput queries, leveraging its columnar storage engine, MPP architecture, cost-based query optimizer, and vectorized execution engine for optimal performance. Additionally, it enables federated querying across various data lakes such as Hive, Iceberg, and Hudi, in addition to traditional databases like MySQL and PostgreSQL. The platform also supports intricate data types, including Array, Map, and JSON, and includes a variant data type that allows for the automatic inference of JSON data structures. Moreover, advanced indexing methods like NGram bloomfilter and inverted index are utilized to enhance its text search functionalities. With a distributed architecture, Doris provides linear scalability, incorporates workload isolation, and implements tiered storage for effective resource management. Beyond these features, it is engineered to accommodate both shared-nothing clusters and the separation of storage and compute resources, thereby offering a flexible solution for a wide range of analytical requirements. In conclusion, Apache Doris not only meets the demands of modern data analytics but also adapts to various environments, making it an invaluable asset for businesses striving for data-driven insights.

The Databricks Data Intelligence Platform empowers every individual within your organization to effectively utilize data and artificial intelligence. Built on a lakehouse architecture, it creates a unified and transparent foundation for comprehensive data management and governance, further enhanced by a Data Intelligence Engine that identifies the unique attributes of your data. Organizations that thrive across various industries will be those that effectively harness the potential of data and AI. Spanning a wide range of functions from ETL processes to data warehousing and generative AI, Databricks simplifies and accelerates the achievement of your data and AI aspirations. By integrating generative AI with the synergistic benefits of a lakehouse, Databricks energizes a Data Intelligence Engine that understands the specific semantics of your data. This capability allows the platform to automatically optimize performance and manage infrastructure in a way that is customized to the requirements of your organization. Moreover, the Data Intelligence Engine is designed to recognize the unique terminology of your business, making the search and exploration of new data as easy as asking a question to a peer, thereby enhancing collaboration and efficiency. This progressive approach not only reshapes how organizations engage with their data but also cultivates a culture of informed decision-making and deeper insights, ultimately leading to sustained competitive advantages.

Estuary Flow, an innovative DataOps platform, equips engineering teams to create large-scale, data-heavy real-time applications with ease and efficiency. By utilizing this platform, teams can seamlessly integrate their databases, pub/sub systems, and SaaS solutions around their data, all while avoiding the need for significant investments in new infrastructure or development efforts. This streamlined approach enhances collaboration and accelerates project timelines, ultimately driving productivity higher within organizations.