Varnish

Varnish Cache is a web accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will boost your website's loading speed. One of the chief merits of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic memory object caching system for increasing the load speed of dynamic database-driven 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 memory caching system uses a two-tier architecture. The Memcached distributed memory caching system is used by some of the most regularly visited websites on the World Wide 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 network applications. Written in JavaScript, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and effective, perfect for high-performance content-rich applications. 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 storage engine is the underlying software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB offers serious improvements in efficiency, reliability and usability. InnoDB offers the standard ACID-compliant database transaction properties, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.