Varnish

Varnish Cache is a web accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will improve the speed of your web site. One of the major strengths of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits 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 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 system uses a client/server architecture. The Memcached distributed memory object caching system is used by some of the most traffic-heavy web sites on the web and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default database engine for the MySQL open-source relational database management system. A database engine is the underlying software component that a DBMS uses to create, read, update and delete data from a database. The latest version of InnoDB features significant improvements in efficacy, stability and usability. InnoDB offers the standard ACID database transaction properties, along with declarative referential integrity support. It is included as standard in most binaries distributed by MySQL AB.