There are several programs to do Project Management.The most widespread is the MicroSoft Project.
In the 2007 costs between 600 and 900 USD. The server version costs upwards of 4000 USD.
There are some free software project management:
DotProject – free and comprehensive tool for project management via web
WebCollab – Simple Projects Manager via web.
GantProject – intended to replace MS Project but is more limited and however fast working.