Varnish

Varnish Cache is a web accelerator also called 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 very, very fast and will improve the loading speed of your website. One of the key 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 memory caching system for increasing the speed of dynamic database-driven websites. It is used to decrease 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 distributed memory caching system uses a client'server architecture. The Memcached memory object caching system is employed by some of the most regularly visited websites on the web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, ideal for high-performance content-heavy network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A database engine is the main software component that a DBMS uses to create, read, modify and delete data from a database. Its latest version features considerable improvements in efficiency, dependability and usability. InnoDB provides the standard ACID transaction attributes, along with referential integrity support. It is included by default in most binaries distributed by MySQL AB.