Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any 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 website. One of the chief strengths of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory caching system for increasing the speed of dynamic database-powered web 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 system uses a client/server architecture. The Memcached distributed memory caching system is used by some of the most regularly visited websites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable Internet 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 real-time content-heavy network applications. 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 DBMS. A database engine is the principal software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest release of InnoDB offers substantial improvements in efficiency, security and functionality. InnoDB provides the standard ACID-compliant database transaction attributes, as well as foreign key support. InnoDB is included as standard in most binary distributions from MySQL AB.