Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will speed up your web site. One of the essential merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to define how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for boosting the loading speed of dynamic database-driven 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 memory caching system is employed by some of the most frequently visited web sites on the web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, ideal for high-performance content-heavy Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A database engine is the primary software component that a database management system uses to create, read, update and delete data from a database. Its latest version features considerable improvements in efficiency, stability and usability. InnoDB offers the standard ACID-compliant database transaction properties, as well as referential integrity support. It is included as standard in most binaries distributed by MySQL AB.