Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will improve your site's loading speed. One of the important merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to choose how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the loading speed of dynamic database-powered web sites. It is used to lower the number of times an external data source (such as a DB or API) is read by caching data and objects in RAM. The Memcached distributed memory object caching system uses a client'server architecture. The Memcached memory caching system is used by some of the most popular sites on the Internet and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, suitable for high-performance data-heavy Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A database engine is the underlying software component that a DBMS uses to create, read, update and delete data from a database. The latest version of InnoDB features considerable improvements in performance, reliability and usability. InnoDB offers the standard ACID-compliant database transaction features, along with referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.