Varnish

Varnish Cache is a web accelerator also popular as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is really, really fast and will improve the speed of your site. One of the key merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to choose how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the load speed of dynamic database-powered websites. It is used to decrease 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 object caching system uses a two-tier architecture. The Memcached distributed memory caching system is employed by some of the most regularly visited websites 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 building highly 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, excellent for high-performance data-rich 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 database management system. A database engine is the primary software component that a DBMS uses to create, read, modify and delete data from a database. Its latest version offers significant improvements in efficiency, reliability and functionality. InnoDB offers the standard ACID database transaction attributes, as well as declarative referential integrity support. It is included by default in most binary distributions from MySQL AB.