Varnish

Varnish Cache is a web accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will increase your web site's speed. One of the major strengths of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the load speed of dynamic database-driven websites. It is used to decrease 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 object caching system uses a client/server architecture. The Memcached memory caching system is used by some of the most frequently visited websites on the Internet and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for building scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O 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 a number of built-in libraries.

InnoDB

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