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 contents. Varnish Cache is very, very fast and will improve your website's loading speed. One of the chief merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to define how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the loading 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 client/server architecture. The Memcached distributed memory caching system is employed by some of the most regularly visited web sites on the Internet and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default database engine for the MySQL open-source relational database management system. A database engine is the main software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest edition features significant improvements in efficiency, security and functionality. InnoDB offers the standard ACID-compliant database transaction features, along with declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.