Varnish

Varnish Cache is a web application accelerator also popular 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 your website's loading speed. One of the main merits of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to define how incoming requests should be handled.

Memcached

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

Node.js

Node.js is a software platform for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and efficient, suitable for high-performance data-intensive network apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. 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 edition of InnoDB features serious improvements in efficiency, security and functionality. InnoDB offers the standard ACID-compliant database transaction properties, along with declarative referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.