Varnish

Varnish Cache is a web accelerator also popular as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will increase the speed of your site. One of the major attributes of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to choose how incoming requests should be handled.

Memcached

Memcached is a generic memory object caching system for boosting the loading speed of dynamic database-powered websites. It is used to reduce 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 memory object caching system uses a client'server architecture. The Memcached system is used by some of the most traffic-intensive websites on the web and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, ideal for high-performance data-intensive network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A storage engine is the main software component that a DBMS uses to create, retrieve, update and delete data from a database. The latest version of InnoDB offers serious improvements in efficiency, reliability and functionality. InnoDB provides the standard ACID-compliant database transaction properties, as well as foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.