MemSQL!

MySQL Community Edition is a freely downloadable version of the world's most popular open source database that is supported by an active community of open source developers and enthusiasts.

Oracle Database delivers industry leading performance, scalability, security and reliability on a choice of clustered or single-servers running Windows, Linux, and UNIX. It provides comprehensive features to easily manage the most demanding transaction processing, business intelligence, and content management applications.

Clustrix is the leading scale-out SQL database engineered for the cloud. With Clustrix, you can scale transaction throughput, run real-time analytics, and simplify operations.

MarkLogic is the only Enterprise NoSQL database, bringing all the features you need into one unified system: a document-centric, schema-agnostic, structure-aware, clustered, transactional, secure, database server with built-in search and a full suite of application services.

The Starcounter database is built with the real-time systems of today in mind. Real-time systems supporting thousands or millions of simultaneous users. Systems like online stores, location-based services or banking applications. Systems where the users need to access same data, and also should be able to update same data. Where numbers need to be correct, independent of if several users are buying from the same stack, or if one changes his mind or another gets his connection cut off half way through. »

NuoDB is a distributed database that can be deployed in any datacenter, in any cloud, anywhere, without the compromises inherent in other New SQL solutions.

Amazon Redshift is a fast, fully managed, petabyte-scale data warehouse solution that makes it simple and cost-effective to efficiently analyze all your data using your existing business intelligence tools.

Actian PSQL combines a NoSQL transactional engine and a SQL relational engine to deliver a zero-DBA database platform for business applications.

DeepDB is a new general purpose database for #BigData and the #Cloud that performs simultaneous transactions and analytics … in real-time, on the same data set.

TimesTen is a memory-optimized, relational database management system with persistence and recoverability. Originally designed and implemented at Hewlett-Packard labs in Palo Alto, California, TimesTen was spun out into a separate startup in 1996 and acquired by Oracle Corporation in 2005.All data within a TimesTen database is located in physical memory (RAM), which means no disk I/O is required for any data operation. This is unlike traditional disk-optimized relational databases such as the Oracle Database, DB2, Informix orSQL Server, whose designs must contain algorithms that attempt to minimize disk accesses. TimesTen provides applications with short, consistent response times and very high throughput required by applications with database-intensive workloads.As memory is far faster than hard disk, TimesTen is heavily used in applications where service level agreements require very low and predictable response times, such as telecommunication, real-time financial services trading applications, network equipment, and large web applications. Also, unlike other memory caching systems that utilize key-value pairs such as Memcached or Cassandra, TimesTen is a full-featured relational database that can be accessed with standard APIs like ODBC, JDBC, OCI, Pro*C/C++ and ODP.NET, and provides the rich functionality of the SQL query language. »

Enea Polyhedra is a family of the two main products Polyhedra IMDB and Polyhedra FlashLite. Both are relational database systems, sharing the same SQL engine, the same client server architecture and protocols, and both support the hot-standby model for use in high-availability systems.

Postgres-XC is a write-scalable synchronous multi-master PostgreSQL cluster with the following features. 1) Both read and write scalability. 2) Configured with more than one server. 3) Complete global transaction and visibility management.

SAP HANA is a completely re-imagined platform for real-time business.