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 the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will make your website load much faster. One of the chief virtues of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to determine how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the speed of dynamic database-powered websites. 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 memory caching system uses a client/server architecture. The Memcached memory object caching system is used by some of the most traffic-heavy sites on the Internet and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and efficient, great for high-performance content-rich applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A database engine is the principal software component that a database management system uses to create, read, update and delete data from a database. Its latest release offers serious improvements in performance, stability and usability. InnoDB offers the standard ACID database transaction features, as well as declarative referential integrity support. It is included by default in most binary distributions from MySQL AB.