Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will increase your web site's speed. One of the major virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to determine how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object caching system for boosting the loading speed of dynamic database-powered websites. It is used to decrease 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 caching system uses a client/server architecture. The Memcached distributed memory object caching system is used by some of the most traffic-hungry websites on the Internet and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet applications. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, perfect for real-time content-intensive Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source relational 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 edition of InnoDB offers significant improvements in efficiency, reliability and functionality. InnoDB provides the standard ACID transaction attributes, as well as declarative referential integrity support. It is included by default in most binaries distributed by MySQL AB.