Varnish

Varnish Cache is a web application accelerator also called 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 improve the speed of your website. One of the major strengths of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to determine how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory caching system for boosting the speed of dynamic database-powered web sites. It is used to decrease 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 distributed memory object caching system uses a two-tier architecture. The Memcached distributed memory object caching system is employed by some of the most traffic-heavy web sites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, perfect for high-performance content-intensive Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source DBMS. A storage engine is the underlying software component that a DBMS uses to create, read, modify and delete data from a database. The latest release of InnoDB features serious improvements in performance, reliability and usability. InnoDB provides the standard ACID database transaction properties, along with declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.