Best Free RDBMS Software of 2025

Percona XtraDB Cluster is an open-source, high availability, MySQL clustering solution. It helps enterprises reduce unexpected downtime and data losses, lower costs, and improve performance and scalability in their database environments. PXC supports critical business applications in the most demanding public and private cloud environments. Percona XtraDB Cluster, (PXC), preserves, secures and protects data as well as revenue streams, by providing the highest availability for business-critical applications. PXC can help you reduce costs, eliminate license fees, and meet budget constraints. Our integrated tools allow you to optimize, maintain, monitor, and monitor your cluster. This allows you to get the most from your MySQL environment.

ThinkSQL is an advanced relational database management system that is compatible with various modern operating systems and hardware configurations. Its design prioritizes complete adherence to the ISO SQL standard, ensuring that it serves as an adaptable and open SQL server for diverse application needs. By following the SQL standard, it incorporates essential features such as transactions, subqueries, views, and set operators like union, except, and intersect, along with managing access privileges and enforcing comprehensive referential constraints to maintain data integrity. Utilizing a multi-versioning engine, ThinkSQL guarantees consistent data views and allows multiple users to access rows simultaneously without the need for locking. Additionally, it supports stored procedures and functions in line with standard syntax and accommodates large multimedia objects seamlessly. Installation is straightforward, and it operates effectively on both Windows ® and Linux ® systems. Moreover, it provides native drivers for ODBC, JDBC™, dbExpress™, and Python, enabling direct connections from any platform for your applications, thus enhancing its versatility and usability. With these capabilities, ThinkSQL stands out as a robust solution for organizations looking to manage their databases effectively.

IBM Informix® is a highly adaptable and efficient database that can effortlessly combine SQL, NoSQL/JSON, as well as time series and spatial data. Its flexibility and user-friendly design position Informix as a top choice for diverse settings, ranging from large-scale enterprise data warehouses to smaller individual application development projects. Moreover, due to its compact footprint and self-managing features, Informix is particularly advantageous for embedded data management applications. The rising demand for IoT data processing necessitates strong integration and processing capabilities, which Informix fulfills with its hybrid database architecture that requires minimal administrative effort and has a small memory footprint while delivering robust functionality. Notably, Informix is well-equipped for multi-tiered architectures that necessitate processing at various levels, including devices, gateway layers, and cloud environments. Furthermore, it incorporates native encryption to safeguard data both at rest and in transit. Additionally, Informix supports a flexible schema alongside multiple APIs and configurations, making it a versatile choice for modern data management challenges.

Amazon ElastiCache enables users to effortlessly establish, operate, and expand widely-used open-source compatible in-memory data stores in the cloud environment. It empowers the development of data-driven applications or enhances the efficiency of existing databases by allowing quick access to data through high throughput and minimal latency in-memory stores. This service is particularly favored for various real-time applications such as caching, session management, gaming, geospatial services, real-time analytics, and queuing. With fully managed options for Redis and Memcached, Amazon ElastiCache caters to demanding applications that necessitate response times in the sub-millisecond range. Functioning as both an in-memory data store and a cache, it is designed to meet the needs of applications that require rapid data retrieval. Furthermore, by utilizing a fully optimized architecture that operates on dedicated nodes for each customer, Amazon ElastiCache guarantees incredibly fast and secure performance for its users' critical workloads. This makes it an essential tool for businesses looking to enhance their application's responsiveness and scalability.

The enterprise database for time series, documents, and vectors. Store any type data and combine the simplicity and scalability NoSQL with SQL. CrateDB is a distributed database that runs queries in milliseconds regardless of the complexity, volume, and velocity.

FrontBase was developed to address the demand for a powerful and scalable relational database server that is designed for internet use, operates without any downtime, and necessitates no administrative efforts. With its remarkable speed, extensive features, and adaptable architecture, FrontBase can provide users with a significant competitive advantage. Not only is FrontBase exceptionally fast, but it also serves as a highly scalable relational database server. Clients utilize FrontBase to build a wide array of databases, ranging from small personal projects to some of the largest enterprise-level systems globally, all while eliminating the need for costly database administration personnel. Established in 1996, FrontBase not only develops essential tools but also crucial applications, including the Command and Control Center for the Copenhagen Police, which is a 24/7 emergency response system. With dedicated support and specialized divisions for Tools, Core Development, and Professional Services, FrontBase is committed to assisting you in reaching your objectives, supported by three global offices that enhance its ability to serve customers effectively. The company’s focus on innovation and client satisfaction continues to drive its success in the ever-evolving tech landscape.

Volt Active Data is a sophisticated data platform designed to streamline your entire technology stack, enhancing speed and cost-effectiveness, enabling applications and businesses to effortlessly scale in alignment with the extremely low latency service level agreements (SLAs) demanded by 5G, IoT, edge computing, and future innovations. It is tailored to complement your current big data assets, including NoSQL, Hadoop, Kubernetes, Kafka, and conventional databases or data warehouses, as it replaces the multiple layers usually necessary for making contextual decisions on streaming data with a singular, cohesive layer that facilitates ingestion to action in under 10 milliseconds. The digital landscape is inundated with data that is generated, stored, often overlooked, and ultimately discarded. "Active Data" refers to the information that requires immediate action for businesses to derive value from it. Numerous traditional and NoSQL data storage solutions are available for managing such data; however, there exists also a category of data that can be monetized, provided that swift action is taken to 'influence the moment' before the opportunity slips away. By harnessing the capabilities of Volt Active Data, organizations can ensure they are not merely collecting data but effectively leveraging it for real-time decision-making and strategic advantage.