eAccelerator is not recommended for new projects or current environments due to its lack of updates and compatibility with modern PHP versions. Instead, server administrators and developers should consider using OPCache or other more actively maintained PHP caching solutions for optimizing PHP application performance.
Apache Ignite - high-performance, integrated and distributed in-memory platform for computing and transacting on...
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
memcached - High-performance, distributed memory object caching system
Varnish - High-performance HTTP accelerator
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Skytable - Skytable is a free and open-source realtime NoSQL database that aims to provide flexible data modelling at scale.