You can find usefull informations about TomTom for Linux users on OpenTom.
It seems the people who run this site are from Maintech.de and they are hired by TomTom to maintain their software.
For the story about OS client :
At the beginning they only provided a Windows client. Then equinux, a reference for Mac software, wrote TamTam. TomTom threatened with a lawsuit equinux which immediately halted the sale of TamTam. That's after TomTom released a Mac client.
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You can find usefull informations about TomTom for Linux users on OpenTom. It seems the people who run this site are from Maintech.de and they are hired by TomTom to maintain their software. For the story about OS client : At the beginning they only provided a Windows client. Then equinux, a reference for Mac software, wrote TamTam. TomTom threatened with a lawsuit equinux which immediately halted the sale of TamTam. That's after TomTom released a Mac client.