Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will make your web site load much faster. One of the important advantages of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to define how incoming requests should be handled.

Memcached

Memcached is a generic memory caching system for boosting the loading speed of dynamic database-driven sites. 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 object caching system uses a client/server architecture. The Memcached distributed memory caching system is employed by some of the most traffic-heavy web sites on the Internet and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, ideal for high-performance data-heavy 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 DBMS. A storage engine is the primary software component that a database management system uses to create, retrieve, update and delete data from a database. The latest release of InnoDB features serious improvements in efficacy, reliability and functionality. InnoDB offers the standard ACID database transaction properties, as well as foreign key support. It is included by default in most binaries distributed by MySQL AB.