Varnish

Varnish Cache is a web accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will improve the speed of your site. One of the main features of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose 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 memory object caching system uses a client'server architecture. The Memcached system is used by some of the most popular sites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a platform for building scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, excellent for high-performance content-intensive Internet applications. 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 DBMS. A storage engine is the primary software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB features significant improvements in efficacy, stability and usability. InnoDB provides the standard ACID-compliant database transaction attributes, along with declarative referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.