FeatureBase is a real-time database built on bitmaps. It is designed primarily for speed and horizontal scalability, and is particularly well-suited for workloads that require many real-time updates, inserts, and deletes on massive datasets.
Materialize is a streaming SQL database for real-time applications, live dashboards, and streaming data pipelines. It provides the simplicity of SQL queries, but with millisecond-level latency for real-time data.
ClickHouse is a fast open-source column-oriented database management system that allows generating analytical data reports in real-time using SQL queries
SingleStoreDB is The Real-Time Distributed SQL Database, designed for data-intensive applications.
SingleStore a modern relational database for cloud and on-premises delivering immediate insights for modern applications and analytical systems. Database for All Data-Intensive Applications