Varnish

Varnish Cache is a web accelerator also known as an HTTP accelerator. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will speed up your website. One of the major pluses of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the loading 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 distributed memory caching system uses a client'server architecture. The Memcached system is used by some of the most traffic-intensive web sites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a platform for building scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and efficient, perfect for real-time data-rich Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source relational database management system. A storage engine is the principal software component that a DBMS uses to create, read, update and delete data from a database. Its latest release features significant improvements in efficiency, reliability and usability. InnoDB offers the standard ACID database transaction properties, as well as foreign key support. It is included as standard in most binary distributions from MySQL AB.