Varnish

Varnish Cache is a web accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will increase your website's loading speed. One of the main merits of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to define how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for boosting the load speed of dynamic database-driven sites. It is used to reduce 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 client'server architecture. The Memcached memory object caching system is employed by some of the most traffic-intensive web sites on the World Wide Web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable network apps. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, suitable for high-performance content-rich network 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 database engine is the underlying software component that a DBMS uses to create, retrieve, update and delete data from a database. The latest version of InnoDB offers serious improvements in performance, dependability and usability. InnoDB provides the standard ACID-compliant transaction attributes, along with declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.