Miranda IM is a free multi protocol instant messenger client for Windows designed to be resource efficient and customisable. It uses very little memory, requires no installation and runs fast even on very old computers. Its powerful plugin system makes Miranda IM extremely flexible. Only the most basic features are built in, but there are currently almost 200 free plugins available for download that allows users to extend the functionality in Miranda IM. Miranda IM is open source and published under the terms of the GNU General Public License.