Citus Data is venture backed by Khosla Ventures and Data Collective. At Citus Data, their mission is to make it so developers never have to worry about scaling their database again. Citus is worry-free Postgres that is built to scale out. Made for SaaS companies and enterprises, Citus is an extension to Postgres that transforms PostgreSQL into a distributed database. Their Citus database is available as open source, as enterprise software you can run anywhere, and as a fully-managed database as a service.
Kognitio is a pioneer in the development of scale-out, in-memory software for big data analytics, providing an ultra-fast, high-concurrency SQL layer that allows modern BI and visualization tools to maintain performance, even when the data volume is large and the user count is high. Kognitio puts standard SQL in front of your Hadoop cluster or data warehouse. On Hadoop it is a standard YARN application, which easily integrates with your existing Hadoop workflows. It's also free to use on Hadoop: in production, in development, in testing, anywhere. For non-Hadoop data sources, can be installed on a standalone hardware infrastructure.
Memurai is a Redis 5 compatible cache and data store for Windows. Memurai runs natively on Windows and it's designed to provide the reliability and performance demanded by enterprise Windows environments. Memurai is an Enterprise solution design to solve the most challenging production workloads. They also provide a free version for developer and testing.