Varnish

Varnish Cache is a web accelerator also popular as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will speed up your site. One of the important virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory object caching system for boosting the load speed of dynamic database-driven websites. 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 distributed memory caching system uses a client/server architecture. The Memcached memory object caching system is employed by some of the most traffic-hungry web sites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, excellent for high-performance data-intensive apps. 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, modify and delete data from a database. Its latest edition features considerable improvements in efficacy, dependability and usability. InnoDB provides the standard ACID transaction attributes, as well as declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.