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 HTTP and configure it to cache the content. Varnish Cache is really, really fast and will speed up your website. One of the key advantages of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to define how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object 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 memory caching system uses a client/server architecture. The Memcached distributed memory caching system is employed by some of the most popular websites on the World Wide Web and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a platform for building scalable network applications. Written in JavaScript, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for high-performance content-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 database management system. A database engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest release offers substantial improvements in efficacy, security and functionality. InnoDB offers the standard ACID-compliant database transaction properties, as well as foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.