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 the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will speed up your site. One of the essential features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to specify how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object caching system for increasing the loading speed of dynamic database-driven sites. It is used to reduce 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 caching system uses a client/server architecture. The Memcached system is employed by some of the most traffic-heavy 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 system for writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, perfect for real-time content-rich Internet apps. 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 DBMS. 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 features significant improvements in efficiency, security and functionality. InnoDB provides the standard ACID-compliant database transaction attributes, along with foreign key support. It is included by default in most binary distributions from MySQL AB.