Varnish

Varnish Cache is a web accelerator also known as a caching HTTP reverse proxy. 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 boost your site's loading speed. One of the important merits of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to choose how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory object caching system for increasing the loading speed of dynamic database-driven sites. It is used to lower the number of times an external data source (such as a DB or API) is read by caching data and objects in RAM. The Memcached system uses a client'server architecture. The Memcached system is employed by some of the most regularly visited web sites on the Internet and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable network applications. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, excellent for real-time content-intensive 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 RDBMS. A storage engine is the underlying software component that a database management system uses to create, read, modify and delete data from a database. The latest release of InnoDB offers considerable improvements in efficiency, dependability and functionality. InnoDB provides the standard ACID database transaction features, as well as declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.