Varnish

Varnish Cache is a web application accelerator also referred to as a caching HTTP reverse proxy. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will boost the speed of your website. One of the major merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic memory caching system for boosting the load speed of dynamic database-powered sites. 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 object caching system uses a two-tier architecture. The Memcached distributed memory caching system is employed by some of the most traffic-hungry websites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and effective, great for real-time content-rich apps. 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 database management system. A database engine is the primary software component that a database management system uses to create, read, modify and delete data from a database. The latest release of InnoDB features serious improvements in efficiency, stability and functionality. InnoDB offers the standard ACID transaction features, along with declarative referential integrity support. It is included by default in most binaries distributed by MySQL AB.