Varnish

Varnish Cache is a web accelerator also known as a caching HTTP reverse proxy. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will increase the speed of your website. One of the key strengths of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to define how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for boosting the speed of dynamic database-powered web sites. It is used to reduce 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 system uses a two-tier architecture. The Memcached system is employed by some of the most regularly 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 writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, ideal for high-performance data-intensive 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 database engine is the main software component that a database management system uses to create, read, modify and delete data from a database. The latest version of InnoDB features serious improvements in efficacy, dependability and usability. InnoDB offers the standard ACID-compliant transaction attributes, along with referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.