I was very surprised when I plugged (USB lead) on my new Tom-Tom 620 GO (WiFi) sat-nav into my PCLinuxOS Laptop and it connected to it with no additional software installed.
Tom-Tom only support Windows and Mac
and for them you have to download some software to make them connect.
This means I can log on to my Tom-Tom account with my laptop and go to 'My-drive' and create a route and then send it to the sat-nav.