Varnish

Varnish Cache is a web application accelerator also famous 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 really, really fast and will increase the loading speed of your site. One of the key advantages of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to choose how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory caching system for boosting the speed of dynamic database-driven 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 object caching system is used by some of the most traffic-heavy web sites on the World Wide Web and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable network applications. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, perfect for high-performance content-heavy Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the underlying software component that a database management system uses to create, read, update and delete data from a database. Its latest release features considerable improvements in performance, stability and functionality. InnoDB provides the standard ACID transaction properties, along with foreign key support. It is included by default in most binary distributions from MySQL AB.