cachelot!

Varnish Cache is an open source, state of the art HTTP application accelerator. You can install it on your HTTP server and it makes your application more accessible.

Couchbase is the NoSQL database market share leader, with production deployments at AOL, Deutsche Post, NTT Docomo, Salesforce.com, Turner Broadcasting Systems, Zynga and hundreds of other organizations worldwide. Couchbase products enable a more flexible, scalable, high-performance, and cost-effective approach to data management than relational database solutions and are particularly well suited for web applications deployed on virtualized or cloud infrastructures, and mobile applications requiring real-time data synchronization between devices and the cloud. Couchbase is a privately held company funded by Accel Partners, Ignition Partners, Mayfield Fund and North Bridge Venture Partners. www.couchbase.com »

Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

The GridGain In-Memory Data Fabric is a proven software solution, which enables high-performance transactions, real-time streaming and fast analytics in a single, comprehensive data access and processing layer. The In-Memory Data Fabric is designed to easily power both existing and new applications in a distributed, massively parallel architecture on affordable, industry-standard hardware.

Hazelcast is an in-memory Open Source data grid based on Java. By having multiple nodes form a cluster, data is evenly distributed among the nodes. This allows for horizontal scalability both in terms of available storage space and processing power. Backups are also distributed in a similar fashion to other nodes, based on configuration, thereby protecting against single node failure.

HyperDex is the next generation key-value store. It provides a rich API, strong consistency, fault-tolerance, and transactions.

Open Source .NET Distributed Cache!

Tarantool is a NoSQL database management system running in a Lua application server. The code is available for free under the terms of BSD license. Supported platforms are GNU/Linux, Mac OS and FreeBSD.

Infinispan is a distributed in-memory key/value data store with optional schema, available under the Apache License 2.0. It can be used both as an embedded Java library and as a language-independent service accessed remotely over a variety of protocols (HotRod, REST, Memcached and WebSockets). It offers advanced functionality such as transactions, events, querying and distributed processing.

Pivotal GemFire® is a real-time distributed data store that solves the hard problems of distributed systems for you. It provides a familiar Java interface for interacting with data of arbitrary complexity and shape, and accommodates ever-growing data sets and users with linear scalability, continuous uptime and predictable performance. With GemFire, you can have data consistency in an elastic environment built for the cloud. You can access information orders of magnitude faster. You can correlate data streams with enterprise data stores—creating competitive advantage where it counts for your organization. »