Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will increase the loading speed of your website. One of the essential merits of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to specify how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the loading speed of dynamic database-powered web sites. It is used to lower 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 system uses a client'server architecture. The Memcached system is used by some of the most frequently visited websites on the web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, excellent for real-time 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 database management system. A storage engine is the underlying software component that a DBMS uses to create, retrieve, update and delete data from a database. Its latest version features substantial improvements in efficiency, dependability and usability. InnoDB offers the standard ACID-compliant database transaction properties, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.