Varnish

Varnish Cache is a web application accelerator also referred to as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will increase your website's loading speed. One of the important merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to determine how incoming requests should be dealt with.

Memcached

Memcached is a generic distributed memory caching system for boosting the loading speed of dynamic database-powered sites. 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 caching system uses a client/server architecture. The Memcached memory caching system is used by some of the most popular websites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, perfect for real-time data-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source RDBMS. A storage engine is the principal software component that a database management system uses to create, read, update and delete data from a database. Its latest edition features considerable improvements in performance, stability and usability. InnoDB provides the standard ACID transaction attributes, along with declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.