Varnish

Varnish Cache is a web application accelerator also called 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 contents. Varnish Cache is really, really fast and will boost your site's speed. One of the chief attributes of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for increasing the speed of dynamic database-driven websites. It is used to lower 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 object caching system uses a client/server architecture. The Memcached system is employed by some of the most traffic-hungry web sites on the World Wide Web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software platform for building scalable Internet 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 data-rich 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 principal software component that a database management system uses to create, read, modify and delete data from a database. Its latest edition features substantial improvements in efficacy, reliability and functionality. InnoDB offers the standard ACID-compliant database transaction features, along with declarative referential integrity support. It is included by default in most binaries distributed by MySQL AB.