Varnish

Varnish Cache is a web accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will speed up your website. One of the major features of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to define how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object caching system for increasing the speed of dynamic database-driven 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 client/server architecture. The Memcached distributed memory caching system is employed by some of the most frequently visited websites on the Internet and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, perfect for high-performance content-rich network applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A database engine is the principal software component that a database management system uses to create, read, update and delete data from a database. Its latest edition offers serious improvements in performance, stability and functionality. InnoDB provides the standard ACID-compliant transaction attributes, as well as referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.