Scylladb is a Cassandra compatible NoSQL column store which can do 1MM transactions/sec per server. It scales up linearly with number of cores. 

ScyllaDB - NoSQL Column Store Database compatible with Cassandra

Raven is an document database for the .NET/Windows platform. Raven offers a flexible data model design to fit the needs of real world systems. Raven stores schema-less JSON documents, allow you to define indexes using Linq queries and focus on low latency and high performance. Its features include:
 <ul><li>Scalable infrastructure: Raven builds on top of existing, proven and scalable infrastructure </li> <li>Simple Windows configuration: Raven is simple to setup and run on windows as either a service or IIS7 website </li> <li>Transactional: Raven support System.Transaction with ACID transactions. If you put data in it, that data is going to stay there </li> <li>Map/Reduce: Easily define map/reduce indexes with Linq queries </li> <li>.NET Client API: Raven comes with a fully functional .NET client API which implements Unit of Work and much more </li> <li>RESTful: Raven is built around a RESTful API </li> </ul>

Raven is an document database for the .NET/Windows platform. Raven offers a flexible data model design to fit the needs of real world systems. Raven stores schema-less JSON documents, allow you to define indexes using Linq queries and focus on low latency and high performance.

RavenDB - NoSQL Database .NET

Aerospike is a distributed, scalable NoSQL database. It provides support to create a high-performance, scalable platform that would meet the needs of today's web-scale applications. It supports operational efficiency, robustness and reliability expected from traditional databases.
 
It eliminates complex, costly caching layers commonly used in NoSQL and in-memory solutions. It 
delivers elastic, predictable performance at internet scale via patented Hybrid Memory Architecture.

Aerospike is a distributed, scalable NoSQL database. It provides support to create a high-performance, scalable platform that would meet the needs of today's web-scale applications. It supports operational efficiency, robustness and reliability expected from traditional databases.

Aerospike Database Server – Flash-optimized, in-memory, nosql database

RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn. It supports JSON data model, Distributed joins, subqueries, aggregation, atomic updates, Hadoop-style map/reduce.
 
It is scalable, supports sharding and replication to multiple nodes. It takes care of machine failures and network interrupts.

RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn. It supports JSON data model, Distributed joins, subqueries, aggregation, atomic updates, Hadoop-style map/reduce.

RethinkDB - Distributed JSON database

GridDB is an In-Memory NoSQL Database for highly scalable IoT applications . It has a KVS (Key-Value Store)-type data model that is suitable for sensor data stored in a timeseries. It is a database that can be easily scaled-out according to the number of sensors. High Reliability It is equipped with a structure to spread out the replication of key value data among fellow nodes so that in the event of a node failure, automatic failover can be carried out in a matter of seconds by using the replication function of other nodes.
 
GridDB utilizes a “Memory first, Storage second” structure. “Hot” data is kept in-memory, allowing for much faster writes/reads on the most-used data.

 GridDB is an In-Memory NoSQL Database for highly scalable IoT applications . It has a KVS (Key-Value Store)-type data model that is suitable for sensor data stored in a timeseries. It is a database that can be easily scaled-out according to the number of sensors. High Reliability It is equipped with a structure to spread out the replication of key value data among fellow nodes so that in the event of a node failure, automatic failover can be carried out in a matter of seconds by using the replication function of other nodes. 

Griddb - High performance, High scalability and High reliability database for big data

YottaDB's diverse feature set as a NoSQL multi-level, key-value data store provides users and businesses with a strong foundation for their critical applications. It operates using a daemon-less engine. Unlike most high-end transactional database engines, YottaDB uses Optimistic Concurrency Control (OCC) to implement ACID transactions. Since transactions do not typically collide, optimistic techniques scale up better than pessimistic techniques such as locking.

YottaDB - Rock solid, Lightning Fast. Secure database

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ScyllaDB - NoSQL Column Store Database compatible with Cassandra

RavenDB - NoSQL Database .NET

Aerospike Database Server – Flash-optimized, in-memory, nosql database

RethinkDB - Distributed JSON database

Griddb - High performance, High scalability and High reliability database for big data

YottaDB - Rock solid, Lightning Fast. Secure database

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ScyllaDB - NoSQL Column Store Database compatible with Cassandra

RavenDB - NoSQL Database .NET

Aerospike Database Server – Flash-optimized, in-memory, nosql database

RethinkDB - Distributed JSON database

Griddb - High performance, High scalability and High reliability database for big data

YottaDB - Rock solid, Lightning Fast. Secure database

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