Varnish

Varnish Cache is a web application accelerator also referred to as an HTTP accelerator. 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 really, really fast and will boost the loading speed of your site. One of the main strengths of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the load speed of dynamic database-powered sites. 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 object caching system uses a two-tier architecture. The Memcached distributed memory caching system is used by some of the most popular sites on the World Wide Web and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, suitable for real-time content-intensive Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database 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, modify and delete data from a database. Its latest edition offers considerable improvements in efficacy, reliability and functionality. InnoDB offers the standard ACID database transaction properties, along with foreign key support. It is included by default in most binaries distributed by MySQL AB.