StandardsDT 0 Junior Poster

In the IT Department I work in were starting to put Asset Tags on every piece of hardware. This includes Phones, Monitors, Desktops, Laptops, Printers, etc. The problem is were currently using Microsoft Visio to enter everything in. This is becoming starting to become a bit tedious with dragging the icon over and linking it up to the appropriate server or switch and entering everything in. And its starting to look like a mess with all the lines, etc. Is there some kind of software that is easier to use then Visio? Preferably open source? I'm an Open Source/Free software kind of person. Any suggestions would be great.