iTop stands for IT Operations Portal.
It is a complete open source and web based IT service management platform including a fully customizable CMDB, a helpdesk system and a document management tool. It is ITIL compliant and easily customizable and extensible thanks to a high number of adds-on and web services to integrate with your IT.
iTop also offers mass import tools to help you being even more efficient.
Project source code has moved to https://github.com/Combodo/iTop