1.
In-Memory Distributed Cache for .NET & Java, Open Source - NCache
https://www.alachisof
.com/ncache/

NCache is an extremely fast and scalable Open Source In-Memory Distributed Cache for .NET and Java that caches app data and stores Web Sessions in multi-server environments.

2.
eXtremeDB Database Management System for Professional Developers - McObject LLC
https://www.mcobjec
.com/

Small, fast, reliable database management system Persistent and/or in-memory data storage for edge-cloud, powerful for professional developers

3.
RocksDB | A persistent key-value store | RocksDB
http://rocksd
.org/

RocksDB is an embeddable persistent key-value store for fast storage.

4.
Apache Kudu - Fast Analytics on Fast Data
https://kudu.apach
.org/

A new open source Apache Hadoop ecosystem project, Apache Kudu completes Hadoop's storage layer to enable fast analytics on fast data

5.
Varnish Software | World-class Content Delivery Solutions
https://www.varnish-softwar
.com/

Content delivery has never been simpler. Powered by a uniquely flexible caching technology, Varnish Software's content delivery products are indispensable.

7.
ScyllaDB | Monstrously Fast + Scalable NoSQL
https://www.scyllad
.com/

ScyllaDB is the distributed database for data-intensive apps that require high performance and low latency.

8.
Red Hat Data Grid
https://www.redha
.com/en/technologies/jboss-middleware/data-grid/

An in-memory, distributed, NoSQL datastore solution that lets your applications access, process, and analyze data.

9.
ZeroMQ
https://zerom
.org/

An open-source universal messaging library