Varnish

Varnish Cache is a web application accelerator also popular as a caching HTTP reverse proxy. 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 speed up your site. One of the major strengths of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to define how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the load speed of dynamic database-powered 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 memory caching system uses a client'server architecture. The Memcached distributed memory caching system is employed by some of the most frequently visited sites on the web and is supported by famous web apps 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-driven, non-blocking I/O model that makes it lightweight and efficient, ideal for high-performance content-rich network 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 database engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. The latest edition of InnoDB offers significant improvements in performance, dependability and functionality. InnoDB offers the standard ACID-compliant database transaction features, along with referential integrity support. It is included as standard in most binaries distributed by MySQL AB.