Varnish

Varnish Cache is a web accelerator also called as an HTTP accelerator. 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 boost the loading speed of your web site. One of the important features of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the loading speed of dynamic database-powered websites. It is used to lower 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 system uses a two-tier architecture. The Memcached distributed memory caching system is used by some of the most frequently visited sites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, great for real-time data-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the underlying software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB offers considerable improvements in efficiency, dependability and functionality. InnoDB provides the standard ACID-compliant transaction features, as well as referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.