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 make your website load much faster. One of the essential merits of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to define how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for increasing the loading speed of dynamic database-driven websites. 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 memory object caching system is used by some of the most traffic-hungry web sites on the Internet and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and efficient, suitable for high-performance content-heavy 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 relational database management system. A database engine is the main software component that a DBMS uses to create, retrieve, update and delete data from a database. Its latest release offers substantial improvements in efficacy, stability and functionality. InnoDB offers the standard ACID database transaction attributes, as well as declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.