Varnish

Varnish Cache is a web application accelerator also called as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will make your website load much faster. One of the major attributes of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory object caching system for increasing the speed of dynamic database-driven websites. It is used to reduce 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 memory caching system uses a two-tier architecture. The Memcached memory object caching system is used by some of the most traffic-heavy web sites on the web and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and efficient, suitable for high-performance data-intensive Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built 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, modify and delete data from a database. The latest release of InnoDB offers considerable improvements in efficacy, dependability and usability. InnoDB provides the standard ACID-compliant database transaction features, as well as referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.