Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is really, really fast and will boost the speed of your web site. One of the main strengths of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to choose how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object caching system for boosting the 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 memory object caching system is used by some of the most traffic-heavy web sites on the Internet and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, ideal for high-performance content-heavy applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source relational database management system. A database engine is the main software component that a DBMS uses to create, read, update and delete data from a database. Its latest release features substantial improvements in efficacy, reliability and functionality. InnoDB offers the standard ACID-compliant database transaction features, as well as foreign key support. It is included as standard in most binaries distributed by MySQL AB.