Varnish

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

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the loading speed of dynamic database-driven websites. It is used to lower the number of times an external data source (such as a database or API) is read by caching data and objects in RAM. The Memcached distributed memory caching system uses a two-tier architecture. The Memcached memory object caching system is employed by some of the most traffic-intensive websites on the World Wide Web and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and efficient, perfect for high-performance data-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A database engine is the principal software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest release features considerable improvements in efficacy, reliability and functionality. InnoDB offers the standard ACID transaction features, along with referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.