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 very, very fast and will boost your web site's loading speed. One of the main merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to determine how incoming requests should be dealt with.

Memcached

Memcached is a generic memory caching system for boosting the speed of dynamic database-driven 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 distributed memory object 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 Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and effective, ideal for real-time content-rich apps. 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 relational database management system. A storage engine is the principal software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest release of InnoDB offers significant improvements in performance, security and functionality. InnoDB offers the standard ACID database transaction features, as well as declarative referential integrity support. It is included as standard in most binaries distributed by MySQL AB.