Varnish

Varnish Cache is a web application accelerator also known 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 really, really fast and will speed up your web site. One of the important features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to determine how incoming requests should be handled.

Memcached

Memcached is a generic 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 object caching system uses a two-tier architecture. The Memcached distributed memory caching system is employed by some of the most popular web sites on the World Wide Web and is supported by famous Content Management Systems 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 efficient, ideal for real-time content-heavy applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A database engine is the underlying software component that a DBMS uses to create, retrieve, update and delete data from a database. Its latest version features serious improvements in efficiency, stability and usability. InnoDB provides the standard ACID database transaction attributes, as well as declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.