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 contents. Varnish Cache is very, very fast and will improve the loading speed of your website. One of the chief merits of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory object caching system for boosting the speed of dynamic database-powered web sites. 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 memory caching system uses a client'server architecture. The Memcached memory object caching system is used by some of the most frequently visited websites on the web and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network apps. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, suitable for real-time data-intensive network applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A storage engine is the primary software component that a DBMS uses to create, read, modify and delete data from a database. Its latest edition features significant improvements in performance, dependability and functionality. InnoDB offers the standard ACID-compliant transaction features, along with foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.