Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. 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 improve your website's speed. One of the major virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

Memcached is a generic memory object caching system for boosting the load speed of dynamic database-driven websites. It is used to lower 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 memory object caching system uses a two-tier architecture. The Memcached memory caching system is employed by some of the most traffic-heavy web sites 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 applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, ideal for real-time content-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 RDBMS. A database engine is the main software component that a database management system uses to create, read, update and delete data from a database. The latest version of InnoDB offers serious improvements in performance, dependability and usability. InnoDB offers the standard ACID-compliant transaction features, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.