LOIC :Dos Attacking tool

What is LOIC
LOIC basically turns your computer’s network connection into a firehose of garbage requests, directed towards a target web server. On its own, one computer rarely generates enough TCP, UDP, or HTTP requests at once to overwhelm a web server—garbage requests can easily ignored while legit requests for web pages are responded to as normal.
But when thousands of users run LOIC at once, the wave of requests become overwhelming, often shutting a web server (or one of its connected machines, like a database server) down completely, or preventing legitimate requests from being answered.

LOIC is more focued on web applications we can also call it applicaton based DOS attack. LOIC can be used on a target site by flooding the server with TCP packets, UDP packets, or HTTP requests with the intention of disrupting the service of a particular host. People have used LOIC to join voluntary botnets.
LOIC is a nice tool to perform dos or ddos attack but try it on your own risk. It does no have an ability to hide your IP address.  Source code is also available .
Download LOIC 1.0.4 here