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 the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will increase the speed of your web site. One of the main pluses of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to choose how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory object caching system for increasing the load 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 memory object caching system uses a client'server architecture. The Memcached memory caching system is used by some of the most regularly visited sites on the World Wide Web and is supported by popular web applications like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default storage engine for the MySQL open-source RDBMS. A database engine is the principal software component that a DBMS uses to create, read, update and delete data from a database. Its latest version offers significant improvements in efficacy, stability and usability. InnoDB offers the standard ACID-compliant database transaction features, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.