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 HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will boost the loading speed of your website. One of the chief attributes of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to determine how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the load speed of dynamic database-driven sites. 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 system uses a two-tier architecture. The Memcached distributed memory caching system is used by some of the most popular websites on the World Wide Web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable network applications. Written in JavaScript, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, ideal for high-performance content-rich apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the main software component that a database management system uses to create, retrieve, update and delete data from a database. The latest edition of InnoDB offers considerable improvements in efficacy, dependability and usability. InnoDB provides the standard ACID database transaction properties, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.