Varnish

Varnish Cache is a web accelerator also referred to as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will improve your web site's speed. One of the essential virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory object caching system for boosting the load speed of dynamic database-powered sites. It is used to lower 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 object caching system uses a two-tier architecture. The Memcached system is employed by some of the most popular websites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, great for high-performance data-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database 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, update and delete data from a database. Its latest edition offers significant improvements in performance, dependability and usability. InnoDB offers the standard ACID database transaction properties, along with declarative referential integrity support. It is included by default in most binary distributions from MySQL AB.