Varnish

Varnish Cache is a web accelerator also popular 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 boost your site's loading speed. One of the chief virtues of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to define how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory caching system for boosting the speed of dynamic database-powered sites. 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 two-tier architecture. The Memcached distributed memory object caching system is used by some of the most popular websites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A storage engine is the main software component that a database management system uses to create, read, update and delete data from a database. Its latest edition offers substantial improvements in efficacy, reliability and usability. InnoDB offers the standard ACID-compliant transaction attributes, as well as referential integrity support. It is included by default in most binary distributions from MySQL AB.