Varnish

Varnish Cache is a web accelerator also called as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will increase the loading speed of your web site. One of the chief features of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to determine how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory caching system for increasing the loading speed of dynamic database-powered web 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 memory object caching system uses a two-tier architecture. The Memcached system is used by some of the most frequently visited sites on the World Wide Web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, great for high-performance data-intensive Internet 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 RDBMS. A storage engine is the underlying software component that a DBMS uses to create, retrieve, update and delete data from a database. The latest version of InnoDB features considerable improvements in efficiency, reliability and functionality. InnoDB provides the standard ACID database transaction properties, along with declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.